I recently got into looking at quicklook plugins, you know, those little programs that makes the finder preview things with the spacebar, and also makes them viewable with Apple's coverflow technology. Well, to my surprise I came over a plug-in that lets OS X display C64 pictures, including Koala and FLI formats.
As cool as this is, I hope this technology will be used for even more Commodore related purposes, such as viewing the inside of a .d64 image file, quickplaying sids and mods, and viewing Amiga IFF ILBM files.
C64 Images QuickLook plugin:
http://p1x3l.net/de/mac-quicklook.html