I have recently moved from a PC to a Mac. I was a massive fan of Irfanview and spent ages looking for a Mac equivalent. That is, until I found Xee.
One feature I would like to see however (the reason why I'm on this website), is the ability to apply colour labels to files as I browse through them. I'm a photographer and this would make picking out the best shots (for further editing) a breeze.
Keep up the good work!