From Amazon.com:
"Get cash back when you buy qualifying Canon digital SLR cameras, single lenses, zoom lenses, Speedlites, or binoculars between October 15, 2006, and January 13, 2007. Double your rebate amounts on each item--for totals of up to $600 or more--when you buy two or more qualifying items."

It"s a little complicated, but read all about it here: Mail-In Rebates on Canon Digital SLR Cameras

This has to make you wonder if new stuff is coming soon.