Android: doubleTwist already lets you sync music, pictures and videos from computers to Android devices, but its native Android player ups the ante. It supports iTunes playlists, ratings information and play counts, making the doubleTwist combo a true "iTunes for Android".
DoubleTwist's player also supports audio and video podcast syncing and playing, and depending on your preferences, might be a bit more tidy-looking than the native Android music player — personally, I still like the looks of Cubed. But the doubleTwist player's real advantage is its integration with the doubleTwist desktop software for Windows and Mac. Because those apps can pull playlists and other data from iTunes and Windows Media Player, Android users can have the same kind of mobile-and-desktop synchronicity that iPod owners enjoy — rate something on your iPod, and it's rated in iTunes.
doubleTwist is a free download for Android units. Tell us what you think of doubleTwist's efforts, and what you'd like to see added next, in the comments.
doubleTwist Player [doubleTwist]