I came across this site earlier, seems to have a good amount of resources linked for anyone looking to implement Windows event log to syslog.
http://www.loganalysis.org/windows-to-syslog/
There’s not much in terms of documentation, but it lists a number of tools which may help people in implementing this. Good luck!
EDIT: Seems in linking to this, I’ve bumped my original blog post relating to Windows/Syslog down the ranks of Google… Bummer!