[joefiorini]

I have yet to find a project management app I like more than AgileZen. It allows me to model my workflow, assess against estimates and to top it off it's very pretty. There are a few things about it that bug me: notifications suck and there is no interaction between projects. Other than that, it's awesome.

[windsurfer]

Redmine? It has a ton of features, so it limits a lot of the more complicated stuff by default. Notifications are awesome, and cross-project stuff works beautifully when using subprojects (shared gantt, cross linked wikis, timelines, etc).