Out of topic perhaps, but not less important ;-)
If you are using Windows Vista and Windows Mobile Device center and wants to sync your media files to a storage card on a Windows Mobile 5 based phone, then you might experience this problem -
You try to synchronize content from Microsoft Windows Media Player 11 to a Microsoft Windows Mobile 5-based device with AKU 2.3 or a later AKU. When you do this, the phone connects. However, only the internal storage on the phone is available in Windows Media Player as a synchronization target.
Find the fix in in KB 931621 called "FIX: Only the external storage is available when you synchronize content from Windows Media Player 11 to a Windows Mobile 5-based device with AKU 2.3 or a later AKU".
Stupid me used almost an hour trying to fix the problem and found the answer within 5 minutes on Google ;-)