Redmine

I think any community that shares code can make very good use of a pastebin and it would make a great addition to the features provided in Redmine.

1. Diff views when comparing revisions.
2. Syntax highlighting.
3. Optional expiration time.
   When the time expires the code is deleted.
4. Optional private codes.
   Password protected.
   Select specific registered members that are allowed to view it.

1 & 2 are the only ones that are important to me but I expect others would inevitably request the other things I mentioned as well.