I'm The_Sweet (or TheSweet, given the disability of using underscores and hyphens in usernames here on Wikipedia), but I used to be known as User:Azurite until I made the fatal mistake of not signing up with an email address for that account. Well, that's all changed.
I run my own Wiki, WikiFic, the Yu-Gi-Oh Encyclopedia, which is small but growing. I also contribute when I can to Project: WikiMoon, the Wiki all about Sailor Moon.
In terms of what I can contribute to Wiki, it'll mostly be about anime and manga, though I do have my fair share of computer, gaming, and random knowledge, too. :)