What bug-reporting tool do you use?

I just discovered FlySpray, which seems like a pretty nice tool for my needs. Especially the upcoming 0.99 release looks good. Since the latest stable release has a bunch of bugs and flow-problems..

Flyspray allows setting up multiple projects, versions, categories.. allows report-generation and can print out bug-dependency tree's (the upcoming release is supposed to do that using SVG !

One of the most popular tools out there seems to be BugZilla, which is pretty big in terms of features, but it's plain ugly and hard to get a good overview of what you are looking at at any given point, especially for non-developers.

So I'm wondering.. what tool do you use? Is there anything you can recommend?