Here's a cool app we haven't mentioned yet here on TUAW -- SlipCover is an app that will help you put together some beautiful icons for your Mac's media files, from DVDs to video games or anything else that needs a cool looking icon. The app itself revolves around "case" files, which are basically templates like the Blu-ray, PS3, and Xbox 360 branding on their DVD cases, to which you can then drag and drop other media on to (for example, put a Watchmen movie poster on a Blu-ray "case," and you've got an icon that looks exactly like a Blu-ray version of the DVD), and then your media files on there to apply the icon automatically. No more hunting around through file names or weird previews of your media -- you can just browse through a Delicious Library-style set of thumbnails to find whatever you want to watch.
Now, you may say that you just get all your media from iTunes, and that those come with thumbnails and covers already, and that's a fair point. But for those of us who obtain media from all over the place, it's nice to have a way to make it look all professional and purty. Slipcover is a free download over on their website.