I just finished implementing a Favorite Games List where you can select the games you like and have them appear in the sidebar above all the others, every time you visit. Simply drag and drop the game icons onto the spaces provided, click Save Favorites to save your changes, and voila! Favorites saved for every time you visit.
Of course, cookies must be enabled for this feature to work. And don't worry about the cookies, the only information I save are the favorites you choose, and the current stylesheet information. If you have any questions at all, leave a comment, but I am hoping I made it simple and usable for most anyone to jump right in with. Click.
Many thanks to Walter Zorn's excellent open source drag-n-drop DHTML library. I was able to extend it to do 'zactly what I wanted to do. =)