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This is an update post to the issue I was having yesterday not being able to update my Droid X to 2.2.
Steps to resolve this are as below -

• Go to Settings -- Data Delivery -- Social Applications
• Disable "Sync over WiFi only" option.
• Dial *228
• Select option 1
• Power down Droid X.
• Remove the battery and after 30 sec put the battery and power it back on.
• Go to "About Phone" and check for "System Updates"

The above method worked for me. The upgrade happened next and then the phone powered down and was back up again.

Note - 2.2 update switches you phone "Battery Mode" to "Nighttime Saver" mode. So no sync will happen between 22:00 - 05:00 when not connect to charger. Is this how 2.2 saves battery? Does anyone know?