[SLUG] Request/issue trackers - options?

[slug@xxxxxxxxxxxx]

Just a general question for the list.

We've got the mediawiki going for general feature whiteboarding but it
really doesn't cut it as an issue/bug database.

I was wondering what other people are using to manage bug lists and issues
/feature requests?

The ones I've heard of include:

Request Tracker
IssueZilla
BugZilla
confluence (not sure if open source?)

Any perferences and/or war stories most appreciated.

ATB

Stu