The problem I've been having is I have a lot of Starcraft replays, and they are just opaque files. They look like this when you preview them:
I have to double click them and open them up to see who is playing who and who won, etc. So I developed this Quick Look plugin to allow previewing replay files. In the same way you can press space to see a preview of an image file, you can now see a preview of a Starcraft 2 replay. Just highlight the replay in Finder and hit the space bar. Below is an example:
open up Terminal and run these commands:
cd ~/Downloads # or wherever you downloaded it
mv SC2Look.qlgenerator ~/Library/QuickLook/
Making it prettier:
If you open the bundle (right click, show package contents) and go to Contents/Resources/, you can see a collection of images and the html template. Please feel free to edit them and make it look nicer. It does still need work.