Ask TUAW: What's your favorite Smart Playlist?

While browsing Doug's AppleScripts for iTunes and Smart Playlists.com last night for some ideas on how to make iTunes do my bidding, it dawned on me that these handy tools of automated music wrangling might make for a great Ask TUAW discussion. After all: who doesn't love music, and who doesn't love sharing their tips for better working (or music listening) bliss?

So what say you, TUAW readers? Do you have a smart playlist and a killer rating system for the perfect party soundtrack? Or perhaps a smart playlist that helps you keep track of which music you need to burn and back up? Feel free to lay it on us and share your smart playlist ninja skills with the rest of the class.