Marcos,
I absolutely agree with the observations jskates makes on that post:
1. A common timeline/schedule/calendar to show milestones and tasks
2. A common place to share files
3. A published system of record for decisions and assumptions
4. A list of “tracking items” that include issues, risks, etc…
5. A contact list of everyone involved in the project
As you know, we are in contact with the PP team, but I am not sure it was formally written in this forum: I think we should consider using PP instead of ActiveCollab as the framework. Maybe when they release 0.9 or 1.0. Another possibility is to start talks about merging both projects.