I can't believe this hasn't migrated from the Get Satisfaction site - Spotify is in dire need of Smart Playlists. iTunes and Media Monkey have hgihly intelligent smart playlist functions, which is great for offlining big playlists in a useful way. I, for example, have a huge starred playlist which I simply can't offline without seriously compromising the speed of my iPhone and more particularly, the Spotify app. If I could restrict it to 100 random songs that I haven't played in the last 6 months, then I could just sync nightly, and listen to a selection of my favorite songs, without causing performance issues. Currently, I have to create playlists manually using Spotibot with my Last.fm loved tracks, which is hassle.