Wikipedia Entry on Blacklights - Where else to start except with an overview of blacklights from the world's best encyclopedia.

List of things that Glow under Blacklights - From about.com.  Nice list!

How to Use Blacklights - Fantastic ehow.com's how-to on blacklights. A must-read.

HowStuffWorks entry on Blacklights - get the lowdown on how blacklights work.

Tips and Tricks for Using Blacklights - useful tips, mostly centered around using blacklights at Halloween. Still, useful general blacklight information.

Using Blacklights to detect Urine - OK, a bit gross. But a common usage of blacklights.

What is a Blacklight?  - A short but useful article.

How Blacklights Work - Another short but good article.

Kids uses of Blacklights - This is a forum thread that discusses different child-related activities involving blacklights.  Lots of good ideas in here.

The Use of Blacklights in Haunts - OK, I mainly included this article because it is from HowToHaunt.com, which is a funny domain name.  But the article is good also!

Generating and Projecting Blacklight - This is a good FAQ about blacklights.

Edible Things that Glow Under Black Light - Who can resist?

This video shows someone microwaving a blacklight. Needless to say, don't do this: