I am loving my X5 (coming from an iPhone 3G) however one thing I am struggling with is managing my music collection. I looked at some forums and found Media Monkey, and it is OK, however doesn't come close to iTunes, especially not with playlists. What do you guys all use?
DoubleTwist will sync your iTunes playlists so that is one option. As to moving away from iTunes, you may want to try J River Media Center. I have been using this and it looks impressive. It does cost which is a big downside, given how many free media players there out there. However its ability to sync playlists to various portable players is impressive too, including on the fly conversions, e.g. FLAC to mp3. It will also import your iTunes library.
I tried Songbird, which is now a Android app, but that is even more of a resource hog that iTunes. Foobar2000 is just, well, too customizable for my tastes. MediaMonkey looks good but I had several crashes that put me off.