This is an unfinished blog idea.

build products: come from some build script normally unversioned/ignored from VCS in some cases pretty useful:

• generated PDF files from latex sources
• autotools generated Makefile.in/Makefiles.

bzr plugin that tracks unversioned files

special handling in case of conflicts: regenerate i.e. bzr needs to know how to regenerate them

reference to continous integration builds like in aegis