you could probably do the same in simple MS Paint. I used Paint shop pro, but all I did was layer them, each layer i heightened the brightness/contrast for them to stand out better, and sharpened each layer. as for the speech bubbles, just put em, each one their own raster layer, and then typed it all out and fitted the bubble to them. i know it dont sound simple, but i'm sure if you play arround, you'll get it pretty quick and get a nice web comic goin.