If you mount your phone as a usb drive on a regular basis, note that any apps on your sdcard will stop working while the sdcard is mounted, so be careful which apps you put there.
To move them, look for app2sd in market is one method.
In Menu -> Settings -> Applications -> Manage Applications when you click on an app you will see a Move to SD button. If the App is moveable, it will be active. If it is grayed out, the app has not been updated to take advantage of this feature yet.
If you mount your phone as a usb drive on a regular basis, note that any apps on your sdcard will stop working while the sdcard is mounted, so be careful which apps you put there.
To move them, look for app2sd in market is one method.