Apparently not. Try using the cable that actually came with the iPad. There is apparently something different about it. Now, backup and sync on my iPad fly
NOW YOU HAVE TO MARK YOUR CABLES
NICE JOB APPLE
You're absolutely correct. It took forever to sync my iPad or rather it was the backup that took a very long time, the syncing wasn't too bad. Well, I figured I just wasn't patient enough. Then I rented a movie or two and was going to transfer it from my computer to the iPad. It took a looong time.
I went to the Apple store and the first thing they asked was - which cable did you use? Is there a difference I asked? Well, technically not, but make sure you use the original iPad cable. Huh??
I went back home and tried it - it's like day and night. Much, much faster backups, movie transfers take 1/5th of the time it took before.
So I thought that maybe my cable was damaged? There are three iPhones in my household (1 x 4G and 2 x 3GS), I tried all three iPhone cables (one of them is brand new) and ALL 3 were much slower when it comes to backing up the iPad. If I skip the backup and only sync then it takes about the same amount of time as with the iPad cable).
Then I called a friend who had similar problems earlier that week and asked her to try syncing with the original iPad cable - she called me later that night saying the difference was very noticeable.
So YES, there's a difference between the cables. I marked the iPad cable but you can tell the difference by the edges of the USB plug in, they're rounder versus the more squarish iPhone USB connector.
Later I figured I'd google this problem and found out I wasn't the only one with this problem. I'm not allowed to post links yet but there are several apple disussion forums I found where they found the same problem I did. Try h t t p:// in front of discussions.apple.com/message.jspa?messageID=11570395 Same issue, same results...