I have just tagged, packaged and announced version 0.4 of my BitTorrent implementation, Unworkable.
Here are the release notes:
Implemented sending peer keep-alives.
Trace log now contains timestamps.
Make us more tolerant of intermittent tracker failures.
Added support for Arch Linux.
Fixed an off-by-four bug which could cause segfaults on some platforms.
Fix zero padding in peer id generation.
Overall code reduction and [...]
