Registration dates aren't even up yet, so I don't think registration has started yet either.
http://www.athrec.mcmaster.c a/intramurals/index.htm
On your right hand side, under "Wanna Play?" there's a link that says "Fall 2008/2009", which gives the registration and play dates for all intramural sports. Currently, it still shows last year's calendar, but hopefully it will get updated soon with the new dates. It does say, however, that last year's dates should give a good indication of when this year's dates will be.
Here is also some info on how to register:
http://www.athrec.mcmaster.c a/intr...ster/index.htm