Stuff you might actually use:
TV Live Shows - Watch TV shows online. I disapprove of TV in general so I only use it to watch certain anime, but it may be of more use to you.
World Wide Metric - online English-Metric conversion calculator.
Zamzar - it is a free online file converter. Yes, this works for YouTube videos. Just check it out. It's neat.
Vixy - this basically does what Zamzar does except that a) it doesn't work most of the time, b) it has less options and c) it doesn't require an email address.
Xs.to - free image-hosting site. No registration required. All image types allowed. Unlimited space.
Hyper File Share - free hosting site. No registration required. All filetypes allowed. Unlimited space.
FindSounds - Sound-searching site.
ColorPicker - Get hex codes for colors. Well, that is what I use it for, but it does some other neat stuff.
Language Tools:
Romanian Lessons - Free knowledge, how great is that?!
Dicţionar de rime (Romanian) - Romanian rhyming dictionary
Dicţionar urban (Romanian) - dictionary of slang of the Romanian language.
Diccionario de la lengua española (Spanish) - Spanish dictionary. Not a translation dictionary or anything, just a dictionary. Like of definitions. In Spanish.
Diccionario de Rimas (Spanish) - Spanish rhyming dictionary
The Alternative Dictionaries - dictionaries of slang in other languages.
Miscellaneous:
Anikaos - Source for kaoani.
The Fish TV - Fish + internetz = win.
Hanamushi - Really freaky Japanese website. Have removed previous comment because it had the risk of offending someone.
PointlessSites.com - List of ... get ready for this ... POINTLESS SITES! Extremely amusing.
Toogle Image Search - The most comprehensive image buggery on the web. What's also cool is you can go into the source and steal the code, muahaha.
The Fragile Circus - Creepy flash stuff. Warning: this is really freaky. I mean, go right ahead, give yourself nightmares, but I warned you....
My Mini City - Name a city, get people to go to it in order to get more population.
WannaLearn.com - Free knowledge, for those willing to learn.
wikiHow - How-To wiki, there's some interesting stuff on there. I've written a few things myself on there actually.
Eupedia - Has lots of info on Europe. One of the ways this could be useful is if you're an American pretending to be European, or vise versa. *whistles and looks away*
eLouai - Wonderful dollmaker site!
Ill Will Press - Official website for Neurotically Yours, THE best cartoon on the Net.
Friends of Foamy - Fan website for the above.
Typorganism - I dunno, a website. Tons of random stuff. There are some pretty neat things in here.
Nobody Here - same description as the above, only it is a MUCH larger site.
Anomalies Unlimited - cryptology site.
Fiction Press - writers can sign up and post their work, and readers can totally go crazy. Love this site!
Name That Goth! - list of names that could be considered "goth" and/or used for goth characters. Heh, my bro and I are both on there.
AoE's Generator Page - name generators for modding and fanfiction of the Elder Scrolls series. USEFUL!
Trippy Colors - I don't know what the actual site is, just this part of it. It's soooo hypnotic... *zombie stare* What else is fun is to listen to music and make it "dance."
Random Character Sequence Generator - Handy for those fake error messages...