My wife has a I Pad that needed a software update to most current version (iOS 4.2). After trying several times to get it to the point of download I almost gave up. The unit would sync to the PC, but would never get thru the BU part. I actually left it hooked up over night.....never got there. Apples solutions for the issue wouldn't correct my problem. I finally found a simple solution using a small software program. I downloaded BackOff http://www.digidna.net/products/backoff/download.
The program shuts down the backup
of the I Pad. After using it, the update took about 5 minutes and went w/o a flaw. Once the software was updated, I turned the backup for the I Pad back on using the same Backup software. And went thru the sync and backup in a little less than 5 minutes.
If you are having a similar problem you might give the program a try.
“May the sun bring you new energy by day, may the moon softly restore you by night, may the rain wash away your worries, may the breeze blow new strength into your being, may you walk gently thorugh the world and know it's beauty all the days of your life.”