I've made my own tool for a distributed bulk builds, distbb.
It is available as a package wip/distbb.
Key features:
- several packages can be built at the same time on different
machines or chroots
- there is no limit on a number of building nodes
- ready for bulk builds with DESTDIR enabled
- logs are better than pbulk's (inspired by Hubert's bulk build)
- no pbulk-like "surprizes" like pkg/36985, pkg/37100, pkg/37700 etc.
Example bulk build result:
http://www.mova.org/~cheusov/pub/pkgsrc-pbulk/Debian-etch/current/log/20080404.1726/META/report.html
I think distbb is in beta stage.
So, bug reports, suggestions, questions etc. are welcome, as always.