Requirements: be in Debian Sarge, have minimal dependencies that aren't already on server
Pluses: Python, no SQL backend, easy setup, full-featured email support, scripting hooks, familiar UI
Minuses: PHP
language db ui email hooks comments bugzilla perl mysql ok some roundup python sqlite? good good good? request-tracker perl mysql/pg slow good? lots of extra dependencies mantis php mysql debbugs perl none jitterbug c none