I've tried to keep track of bug reports and feature requests via email, and it's just not working. So I gave up and set up a bug tracking page at http://bugs.pablotron.org/. Thomas (redshift) and I went through a handful of them, including Bugzilla (too much of a hassle to configure, pain in the ass to use), Flyspray (klunky user interface), Mantis (no easy anonymous view), CVSTrac (only one project per repository? gee, that's useful), and finally settled on PHPBugTracker, which does what I need and annoys me less than the rest. I also read this semi-dated article on bug trackers; I didn't pay much attention to the rank he gave each tracker, but it is a nice list of bug trackers out there.