How about:
Rebutt
TrollkillerX
Hoaxbuster Harry
Retry, Abort, then Ignore
A Hand In Bush (worth more than a bird, right?)
New Urban Legend
Whizzy Wig
Tribble
HortaLover (eww)
A few handle suggestions:
Zarathustra
Event Horizon
I see dead people
Erasmus
My ass is on fire
Azimuth
Reused condom
Mastor the Castor
There is no spoon
Cyrus the Virus
Menage a Trois
Darth Yoda
Xtreme Pervertion
Hyper Quasar 
Eternal Entropy
Rebel without a clue
American Bad Ass
Oblivion
Van Gogh’s ear
I came, I farted, I left (a stinking odor)
Magna cum laude pussy–from Basic Instinct–
Perpetual Orgasm
Jesus666
Captain Nemo
Nosferatu
Achilles Other Heel
Ground Zero
Dali Lama
Pinocchio’s Nose
Cecil AdamsTM
Tell me if you need more…
Pizza the Hutt
Nemesis
Poseidon
Anus the paganus
Silas Greenback, the name of the villainous frog from the Danger Mouse cartoons?
aw crap…
I just thought of a cool username yesterday and now I forget what it was…
damn TV is ruining my mind
I’m just glad DocDaneeka wasn’t taken. I was a bit bummed about Yossarian being unavailable, but hell, I’ve had experience with people thinking I was dead when I was standing right there…
Just be glad I didn’t go with MajorMajorMajorMajor.
The coolest names I ever made up (I suck at making up names) were Brether Taine for a guy and Shaladra for a girl.
Shaladra is my daughter’s middle name, and my ex-wife uses it as her handle online.
PS. This was my virgin post. It only hurt a little.
To Serve Man would be odd and vaguely amusing.
Female dopers, wouldn’t you like to call yourselves:
Jennifer López’ ass
I did the Hitchhiker’s Guide username thing for a while, as Wowbagger the Infinitely Prolonged, but I was getting too many request from people wanting insults. I’d gladly take Fenchurch if only I was the correct gender.
A few ideas…
Wallflower Power
CarpalTunnelMan
Incognito
Entropy
Furry Utopia
Standard Candle
Whoositz
Camelepardus
The Cat Who Went Mad Under the Light of the Moon
Mars Needs Omelets
Wild Goose
Pipe Dream
Imzadi
Casual Madness
Frostbite Moon
Alcoholocaust is cool. A bit long, though.
I’m a trollop. is that close to being a nymph? 
These names are all so great. I especially like Frostbite Moon. Makes Zoggie seem really dull.
Here are other names i like:
The Ultimate Tampon (can’t get rid of that one)
Big Bigger Biggest
Moon Pie A La Mode
RazorBladeAngst
BadAndy
How about “JFK Jr.'s Rotting Corpse”
These here, these are what you want:
Hiro Protagonist
Wintermute
Snow Crash
Deathmonkey Fancypants
Scribblin’ Gibbon
antilog
SineHerePlease
Cosiner
Amalgamated, Incorporated
Amalgamated Diversified
Unlimited, Ltd.
2Line 2Time
Asimov Clarke
Videohead (Also a possible Alternative Rock/Industrial/Rave band name)
me@large
jeklkej
Transistorized!
Tubetester
Ten Percent Pure
Precision Mod
Base Two
Distributed Standard
Djinn and Tonic
Corona
Bomblight
Tangent
Logos Rhythm
Nicean Creed
Batdance
Delphic
Pallas Athena
Zoner
Stoned Alive
Cornball
CHiPs
THiCk
RatePerMinute
Descending Increase
Osip (just kidding)
Spaghetti and Hairballs
Zotted
Zotter
Orrie
Zot!
Woodchuck
Car Rec
Ty Game
Ghast
Lert
Dult
cement (wait, concrete plans on taking that one :))
Mausketeer
Derived Value
Possible
This Space Intentionally Left Blank
BodhiSeltzer
or, as agiasofia changed it to (and I like better)…
BodhiSativa
Tyrone Shoelaces
Sara Bellum
Mahatma Coat
S Kit Zoid
Play Ger Ism
I Kin Spel
Punk U Ation
How about
Inglch Mager
I have to say:
ramedog
ramiusdogius
nartfack
peace dj
I_BEE_LUCIOUS
That’s all the ‘crazy’ ones I have for now.
Camel Toe
I know this post is dead, but I just found this list of names that I recommended to somebody on another board (This site to be exact), and just had to share.
Young Gandhi
Sinister Dexter
GoofusGallant
The Oppenheimer Effect
Parallelogram
S.P.A.S.T.I.C., The Robot That Walked Like A Man!
Too Many Monkeys
What’s Inside The Pentagon?
Mr. Whipple
Tinky-Winky
DECREATOR
Window Pain
Jackie Chan
Dipsy
Gremlin
Televised Mind-Control
George
Laa-Laa
Helen
Technoholic
My Neighbor’s Cat Knows My Name And Wants To Kill Me
Po
The Military-Industrial Complex
Organic Soup
Biscuit
In fact, if I didn’t already have a username, Too Many Monkeys would be my next choice. (Although I do have a fondness for My Neighbor’s Cat Knows My Name And Wants To Kill Me.)