If you're not familiar with DoubleTwist, it's a company founded by 'DVD Jon' Lech Johansen - who reverse-engineered the encryption in DVDs and the iTunes store and now offers a desktop media player for Mac and Windows.
In addition to that, DoubleTwist is now capable of syncing with your iPhone & iPod Touch. It looks like we (iPod Touch & iPhone users) now have a great alternative to Apples boated iTunes software.
Please refer to this forum post for a list of what's new
You may download the updated version of DoubleTwist here.