TheFilter has long been a popular iTunes plugin for helping sort through your iTunes music and automatically build playlists. You can still get TheFilter as an iTunes plugin but it's also a web-based suggestion engine for media of all sorts.
Just like before, if you're in Windows, you can install a plugin for iTunes — Windows Media Player and Winamp too. Doing so allows you to not only sort and generate playlists in the respective media players but also beam your music habits into TheFilter's main site. Even if you opt to use TheFilter in a web-based format only you can quickly build a database by importing your Flixster and Last.fm information or start from scratch by entering in your favourite bands, movies, and browsing web-based videos and ranking them on TheFilter.
You can rank everything from the whole song or movie to the individual people encompassed by it — musicians, actors, directors, and so on. The view you see above, of the giant heart, is the "taste sphere" that shows you where the things you rank in relation to your taste. The thing you give high ranking gravitate towards the heart and the things that you dislike or that fall out of your favour gravitate towards the graveyard on the surface of the sphere.
TheFilter is free and requires a basic signup. The web-based service is available to everyone, but the plugins for iTunes, WMP and Winamp are Windows only. Have a favourite suggestion service? Let's hear about it in the comments.