what are your favorite plugins?

+100000000!

Anything written by Rick Olsen (technoweenie)… reading through the tests is an education in itself.

http://svn.techno-weenie.net/projects/plugins/

Seriously, I had never even heard of TDD, and Rick’s tests really opened my eyes to what good TDD is all about.

Speaking of testing, I wouldn't go so far as to call this my favourite
plugin, but it proved very useful when I needed it:
http://www.agilewebdevelopment.com/plugins/upload_mock

martin