If your creative or non-fiction writing requires a bibliography or citations, you'll want to check out Easybib.
Fellow writer J and I met one of the creators of the EasyBib after making our presentation about teen writers' groups at the Illinois Library Association Annual Meeting in Chicago last fall. The idea for the site was born after its creators (college students at the time) were assigned a flurry of research papers requiring bibliographies with conflicating citation styles. Tired of scrambling for the proper format for each professor, they set out creating the go-to source for bibliographies and citations. Millions of students have used the site since its creation in 2001. Ingenious.
As J said (in so many words) after hearing the story: You've got to love it when college students use their powers for good.
Sigh. I wish I had had this nifty little tool while at Vermont College. It would have made the task of writing all those critical essays A LOT less painless.