Comment on FFView

Note: if you want your images to be smoothly zoomed or fit to the screen, be sure to check the antialiasing option. (Found in 'Options' menu, not in 'Preferences'.)
If you don't, you'll get a quite ugly 'stairs' effect when not zoomed at 100%.

(Looks like linear interpolation vs. cubic interpolation, more information on this subject, comparing Mac OS X vs. Windows XP here (in French).)