I use Faststone 4.6 for viewing pix and pping them. I know it's not very advanced, but it suits me very well.
I only use jpegs. So all my digital pics are jpegs and the scanner outputs the images as jpegs.
Thing is, the colours are all a bit 'pastel like'. The bright, vivid colours on the Kodachrome are quite muted on the jpegs the Coolscan is putting out.
It might be possible to pp them back to life, but I'd rather see better colours in the scans as they come out the scanner. It was an expensive item to buy, and it's either not set up properly or not very good at scanning.