Check your nick availability across multiple sites.

[littleman]

http://namechk.com/

[ergophobe]

That's cool.

If I were trying to come up with a brand name, that would be seriously useful.

[Rupert]

thanks, bookmarked.

[JasonD]

reminds me of http://knowem.com/ launched by a bunch of SEOs a few years ago.

[Drastic]

scrapebox has a robust vanity checker addon as well.