Subversion Links
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Trac combines Wiki, SCM, and bug tracking in an innovative way (screenshots). And it's free software (GPL).
Subversion-Bugzilla integration using Bugzilla's mail processing. I wrote a similar script that punches entries into the database directly.
Issuetrackers standard. My script doesn't follow this. ;)
Subversion projects on Freshmeat.
Scmbug purports to integrate any supported SCM system with any supported issue tracker, but I couldn't get it to work on AIX, which is why I wrote a simpler hook to do the job.