Don't know if these have been already posted, but i think it would be great if cam2pc were able to...
Manage and convert raw image formats
Show the histogram of the three colors (white area istogram with the 3 RGB color lines on it) togheter with the overall histogram instead than only one channel at a time
The ability to "blink" overexposed parts of the image like my powershot s45...
a few more image filters
Cam2pc is the best image browser - downloader - fast enhancher on the net and i think these features would make it even better (especially raw support would make it suitable for professionists).