Talkback specifications

Where can I find the detailed specifications of the talkback component that ship with all official released products from the mozilla foundation.
What does the product add to system's crash reports ?
How does it work ?
What are the equivallent Open source solutions (are there any) ?

I'am asking all this because I think it would be very nice to start such open source project, that could leverage end-users crash reports.

I'de be delighted to join an existing project if such thing exists.

Update:
via IRC

ok so talkback...
the tinderboxen make builds with symbols
those symbols then get sent to the Talkback server
then the tinderbox gets from CVS (or the talkback server, not sure) the talkback executable, the .ini with version info, etc.
then the tinderbox packages everything together
now if it crashes, it sends a stacktrace in the form blabla.dll!0x12345678
(so a raw hex stacktrace with file names)
the talkback server then combines this data with the symbol data
and so you get a stacktrace
i heard OpenOffice has some opensource crash tracker

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