So there's been some discussion on various APR and Subversion mailing lists recently about exactly how to implement POSIX style condition variables on a Win32 system.
The existing implementation in APR is buggy, and we need a better one before we can merge the work that's been done on making svnserve use a pool of threads into Subversion's trunk. After everyone and their brother posted their (flawed) schemes on how to do it, Branko finally posted a link to a paper containing more than you ever wanted to know about implementing condition variables on win32 systems.
I doubt anyone who reads this is especially interested in this stuff, but I wanted to post it here so I remember to go back to it later and read the rest ;-)