Hmm, been thinking about this recently…
I’m partial to:
AwSnappity
CanvasShoes
Go You Big Red Fire Engine
Stately Plump Buck Mulligan
Jacknifed Juggernaut
Happy Scrappy Hero Pup
…and, not sure if they’re still around but The Loaded Dog and Im thecowgodmoo (sp) always made me laugh just to see their handles.
Aw Snappity has officially become the phrase of choice among my fantasy football league. When someone’s player(s) totally choke, usually a picture of that player getting creamed by a lineman will circulate via e-mail the following Monday, repleat with that phrase on it.
So thanks dude!
Cooler of Death was pretty amusing.
Well, you know, they only really show tentacle monsters during the sex scenes. When they’re not violating the innocence of schoolgirls, they enjoy tea and crumpets, classical music from the Romantic period, and impressionist paintings.
No offense taken.
Nothing else even comes close.
The #1 greatest user name in my book is flapcats. I kick myself for not thinking of it first every time he (she?) posts.
A close 2nd is Happy Scrappy Hero Pup.
I’m preferential to: The Asbestos Mango, AwSnappity and fishbicycle for their humor value. I like Abbie Carmichael because she was one of my favorite characters on my favorite show. And I like JayElle because I feel great sympatico with her name.
Yay! Somebody picked me!
:: does happy dance ::
For the same reason mine isn’t. Apparently, we suck.
I’m right there with you, brother.
Mr. Blue Sky is a perfectly good name…reminds me of the Allman Brothers’ song. And Superdude brings back ye olde “All That” memories.
“He’s lactose intolerant! That means he can’t eat dairy products like milk or cheese!”
Dudette 
I’m partial to FireUnderpantsBoobs, myself.
Okay, okay, for real: owlstretchingtime. What does it mean? I’ll never know. But I like it just the same. I might give that name to my firstborn, I’m undecided as of yet. What do you all think of owlstretchingtime Ashley if it’s a girl, and owlstretchingtime Joseph if it’s a boy?
The World’s Most Deadliest…. I don’t know why, but it just conjures up some clever but curious little kid writing his/her first scifi novel or something. It’s just cute in a cuddly warm fuzzy way to me.
Sorry TWMD if that wasn’t your intention. 
I usually post something else, but this time I’d like to nominate Ryle Dup. For some reason that just seems to be an apt and amusing title to me these days.
I love…
**Qadgop the Mercotan ** (no idea what it means)
**Diogenes the Cynic
Go You Big Red Fire Engine
Mr. Blue Sky** (Hey, I love ELO)
**Roland Orzabal ** (Hey, I love TfF)
**Gangster Octopus
danceswithcats
Bosda Di’Chi of Tricor ** (not a clue what it means, I just love it)
**Left Hand of Dorkness
The Chao Goes Mu ** (very clever)
**My Darn Snake Legs **
Caught@Work is my favorite username 
The name you with the face makes me happy.
Yoyodyne, although it only makes sense if you ge the movie reference.
Mathocist, the Board’s uber-mathematician.
I think owlstretchingtime was a fake TV show that was tossed out in a Monty Python sketch.
We have a nice bunch of owl posters on the boards: screechowl and owl of cream cheese, but I’ve heard the latter was a typo that stuck.
Wasn’t there a poster Don’t poke the bear, Dad?
Looking through the wayback machine, I can remember:
Tequila Mockingbird, Drain Bead,
as a couple of my favorites.
And partly because I’m stupid, ok well, mostly because of my stupidity, I had always read Sue Duhnym, as Sue Done Him, until I did the math correctly and figured it out.
Same thing with Sofa King.
I try.