a) Very cool product.
b) Would be great if you could explore if flickr / other photo sharing sites offer apis which allow you to search for photos by camera in the exif tags. If so, then having a gallery of photos taken by the camera would be nice.
c) Improve the front page design. Too much space is wasted imo.
I am not a designer, so was staying away from specifics, but here are a few armchair observations
a) Your front page should be a jumping spot to the major things you offer. Right now I see your top tool bars, the explore|compare|learn columns and then one camera and then have to scroll down to see the rest. Heres a suggested improvement -> Just retain the explore|compare|learn columns and add ~128x128 thumbnails for the popular cameras in each category. So with five thumbnails you can cover a good camera in each category.
b) How about adding "Ultra Compact", "Travel Zoom" etc in the Just Tell me section.
c) Add the "compares the latest cameras and give personal recommendations" to the top black toolbar as a tagline and get rid of the second white toolbar.
d) Maybe add jump off points for popular use cases like -> "Take photos of kids sport events" etc.
e) Letting people ask their fb network for camera recommendations would be great. ie less technical users put a "request for camera advice", their friends click on it, come to your site and pick cameras for them, which shows up on the persons fb widget. Ultimately the person can pick the most recommended cameras. This might increase the viral coefficient of your product.