I bought a 30D and a Canon lens before Christmas and sent in my rebate info. I checked on it today and you have to do a little navigating, but you can check the status of your rebate.

To do this go to: http://www.usa.canon.com, then select CONSUMER from the SUPPORT drop down menu. Next, click on the PROMOTIONS tab.
Under the Cash In With Canon promotion, there is a place to click and pre-qualify your rebate (which I did before sending in) and you’ll want to click that little link.

Then, click Pre-Qualify Your Rebate and there will be a link at the top of that page to Check Your Rebate Status.

Thankfully, mine has been processed. Just waiting for it to be mailed now. I thought I’d put up this info because it took me quite a while to find where to check on mine.