Pluses:
- VERY easy installation and administration.
I know, it's not rocket science to install and administer Trac or dotProject but still, I had a pleasant feeling of being in control when I finished the installation[1] in just under 5min. - has everything one (ok ... me) wants out of the box.
Wiki, Timeline (for both 'features' and 'source code' activities), Milestones, Calendar, Revision control, Issue Tracking, Gannt charts, Time-spend tracking/planning.
- has everything one (ok ... me) wants, working cool.
Yeah, ok, I already said that.
- supports multiple projects
Minuses:
- Lack of themes
- Probably some more will come up ...
[1]: Redmine Installation