What tools do fellow hackers use to track their bugs, issues, features and client/user feedback. Do you like it or hate it? If you don't use one, why not?
EDIT: As some of you may know, we're building a bug tracking tool of sorts (actually something a lot different to all the tools listed). The point of this poll is to find out what folks like us are currently using. Your input would be greatly appreciated!
We switched to Jira after getting annoyed at Mantis once too often. We all had experience with Bugzilla, which is like using bow and arrow in these days of guns. We investigated for a bit, looked at Trac and FogBugz amongst others, but decided in favor of Jira, primarily because of Greenhopper. Issue management without decent planning abilities is like a blunt knife: usable, but unnecessarily hard. Haven't regretted it one single bit.