TSN ESPN Canada, one of the quicker official sites. They also have a trade center.
Sportsnet.ca Usually the other site that is quickly updated on tradeday. I linked to the transaction page, which displays transactions almost instantly.
2man advantage RD's site, from her work here in previous years this will be a quality place to check.
Spectors The king of trade rumors. None come close, and usually does a great job if cutting through the clutter.
The fourth period A fan run site, has several posters from here involved. Including NJD Jester (Greg)
This isn't an all comprehensive list. I did leave off other fan sites (like HF Boards) as they are notorious for posting unverified trades.
Edited by DevilMinder, 26 February 2007 - 11:38 AM.