Apport - Automatic problem reporting tool.
Apport-retrace - Guide to creating symbolized stack retraces.
MozillaTeam Packages From Source
General Info - pitti's MOTU school session on patching sources
Special Case: Configure.in Patches - special case: what to do if you have a patch that touches configure.in
Downstream - Guidelines for interacting with downstreams.
Upstream - Guidelines for interacting with upstreams.