New Firefox extension for Firebug.  Firebug is already THE tool for any web developer.

All you web developers using Firebug, go get Firecookie so you get cookie control all right in Firebug interface.

http://www.janodvarko.cz/firecookie

Already found myself using it more than I thought I would.  So much more power being able to more than just view your cookies.

Get it, get it, get it!