Not sure why peeps use desktop software to do anything. And if you just have to sync your media with a desktop then DoubleTwist is king for me. Otherwise use the cloud.
To control data usage...
1. Install DroidWall to limit what apps use the net.
2. 3G Watchdog tracks your usage and breaks your usage down by app so you can find the hogs easier - and block them with Droidwall.
I only have a 100MB data bundle. Use wifi mostly.
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Ug, Droidwall requires you to root your phone