Cookbooks.
I’m quite boring.
Oh, they’re around. But it seems most of them have the 4" barrel, or the 2" ones hav the square butt. Not especially uncommon though. The LPU-21/P was harder to get in the '80s. (I finally broke down and bought a new one.) It’s really hard to avoid opening up the hermetically sealed survival kits.
Colophons
I’d like to get a hold of one, but I’m not sure of how to display it. I’d like to find a locking case, but I really haven’t looked all that much for the firearms yet. I really need to taper off, I’ve gotten $5k worth of stuff in the last couple of years. It’ll be an awsome display if I ever get off of my butt and finish it off.
Fisher Price Dolls - mainly from the 1970s and early 1980s. This includes all the soft-bodied dolls with plastic heads and hands (Baby Ann, Natalie, Audrey, etc.) and the My Friends[sup]TM[/sup] dolls (Mandy, Jenny, Becky). I also have several sets of clothes for them. Current count is a complete boxed set of all the My Friends[sup]TM[/sup], a complete set of the smaller dolls, and a number of extras and duplicates just in case anyone wants to play with them.
SeaWees- Little plastic mermaids from the 1970s and 1980s with colored hair, sponge illy pads, and pets/babies. I have about 30ish of those.
Barbies- I have about 75ish of those in their boxes, and a few out of their boxes.
Dragonfly stuff - I have numerous knickknacks concerning dragonflies.
Oh wow, I’d completely forgotten about them! 
I collect elephants with the trunk down. This is just to make it a bit more challenging. Most elephant figurines have their trunks up, “to keep the luck in” or some superstitious nonsense. My mom, in particular, has a flair for finding really unusual elephant stuff. The pride of my collection is a stoneware lantern thingie that you put a candle in, in the shape of an elephant wearing an expression of intense concentration, with a crazy-looking bird (endowed with magenta and turquios fake feathers) perched on his shoulder. It’s . . . unique.
I used to collect Marvin the Martian stuff, but Warner Bros. doesn’t quite saturate the marketplace like it used to, so that’s kind of tapered off.
I maintain these collections as a kindness to my relatives, so they know what to buy me for Christmas and my birthday. My husband, foolishly, hasn’t established a collection of anything in particular, so his family decided, out of the blue, that he was going to collect beer steins. He’s not of German extraction, and he doesn’t drink beer, so this was an odd choice. However, we now have three of them, including an extremely tacky and huge Star Wars stein. I hide them in the spare room. I have no idea what I’m going to do with them when we move this fall and his mother will be visiting more frequently.
this many posts and no one has made the obvious reference?
oh well, someone has to 
I collect spores, molds, and fungus (Egon Spengler, Ghostbusters)
seriously though, my current collection is Spyderco knives and Victorinox Swiss Army Knives, to a lesser extent, flashlights, no real rhyme or reason, if it looks good, pick it up
I had a good collection of music boxes but wound up with no space for them, so have sold a lot of them.
Sugar wrappers. They are in a scrapbook and there are well over a thousand of them.
Non-sport trading cards. Again, I am selling many of these, but I still have quite a few.
Elongated souvenir pennies. They are in a specially designed holder and I have about two dozen so far.
Damn, I really thought I’d get to that first. 
I don’t have anything I’m super-serious about collecting, but anyone who’s ever had to buy me a gift knows they can’t go wrong with anything Superman or Star Wars-related. I probably own about five to six hundred DVDs, so I guess that could accurately be called a collection.
Sand. I collect sand from the beaches around the world I’ve travelled to. I put it in identical glass jars, label where it’s from and they’re in a nice wood and glass display case. Recently, people have found out I do this and they’ve brought me back samples from their travels too. So… if’n anyone collects something really neat or unusual and wants to send me some I’ll gladly reimburse you for the postage.
Also coins, stamps, art, guns and antiques.
I collect four leaf clovers.
I am just one of those people that find them all the time. It just isnt summer until I get my first clover.
I also have a 6 leafer as well
I collect souveniers from the 1893 World’s Fair in Chicago.
I also really dig Coca-Cola stuff, and I have a ton of it. I was working on collecting all their ads from the backs of National Geographic (they had an ad on the back of the mag every month for something like 40 years, I think).
Holy Shit. You’re not by chance the person with the screen name Hook over @ RateYourMusic.com, are you?
Do you have a Marvin motorized Pez dispenser? If not, have I got a deal for you! I have 5 of them, NIB. (Don’t ask!) 
Can anyone, really, go wrong collecting Star Wars stuff? I don’t think that’s possible.
As mentioned in a previous thread I used to collect old metal lighters, like Zippos and Ronsons and the like, but I’ve stopped acquiring new ones for the time being.
I actively collect alcohol related items such as pint glasses, bar signs, etc largely related to Guinness or Harp and other Irish beers and whiskeys. Along those lines I collect
“cool” looking glassware, to the point that I’m not allowed to bring any more home unless we move and get a bigger kitchen and bar area to hold them.
The only other thing that I consider a collection is fishing gear, but I use almost all of it so it’s a rather functional collection. I don’t consider my guns as collectibles as they’re pretty common and not all that special.
Nope, sorry. The music sites I visit are mainly gemm.com and allmusic.com, but I haven’t left a review anywhere. I do research, and have had some of it used in print.
I’ve got about 75 or so churchkey bottle openers with brewery branding on them – I was much more into it a few years ago before I started to concentrate more on collecting breweriana (mostly bottles, bottle labels, ink blotters, pens, matchbooks, and, umm, churchkeys) from closed Colorado breweries like Denver’s Tivoli and Zang, and Walter’s in Pueblo.
Thundercats stuff - I have most of the toys and all of the Star comics, so mostly I’m working on the UK comics and wierd and hard to find stuff.
Silverhawks - same deal.
Other toys - things that catch my interest - Megabloks dragons, Megabloks Radix Adventures & Sigma 6 right now.
Oriental stuff - kimono (ok, I only have one), haori (I’ve got two), fabric dolls, fu dogs, and other things that catch my eye.
I kinda collect knives (to wear during RenFaire) and, of course, I have a buttload of books (mostly sci-fi and fantasy). And bookends.