I tested my brand new Canon 7D camera recently at the Phoenix International Raceway. #2 Kurt Busch, from the University of Arizona, finished 7th.
I found the 7D a delight. It is bulkier than the Canon XSi, the camera I had before this, but it just feels like a pro camera. It also has a nice 8fps burst rate. It sounds like a machine gun! I used a Tamron 18-270mm lens and sometimes I used the Tamron 1.4x extender, too. All were 100 ISO and I used Adobe Lightroom for editing and uploading to Flickr.
Another interesting feature on the Canon 7D is the ability to take high definition video. I can switch to video mode easily on the camera and even take photos while recording video! Here is a short example of video taken during the race. Turn up your volume so you can hear the zoom.
I held off buying the Canon 7D because I didn't really need the video. I have a Canon HF200 which is a wonderful HD video camera. But how many times have you been to an event and they say cameras are ok but no video? Ha ha, the 7D takes care of that problem nicely.
I am a National Association of Photoshop Professionals (NAPP) member and got a smoking deal on shipping with the 7D from B&H.