I don't think that a forum is the ideal solution for bug tracking because IMHO you don't have a clear view of everything what is going on.
luzr
... And usual scenario is more like "question in the forum" -> "testcase requested" ( and then either bug found in testcase or bug found in U++ ...
I think the forum is still a very good place to ask questions about how to use U++. The bug tracker would be there to report bugs and request features and not to ask questions.
I took a look trough a few bug tracking apps that I found that a are PHP based, and I think http://flyspray.org/ really looks great.
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and then either bug found in testcase or bug found in U++ ...
