How do I stop auto sync of my iPad?

It's an iTunes option. Connect the iPad and select it on the left side of iTunes.
On the "Summary tab at the top, uncheck "Open iTunes when this iPad is connected" You can also go thru the tabs and uncheck sync "contacts, calendars, mail", Apps, Movies, Music, Tv shows, Podcasts, books, and photos depending on what you want to do.

Doesn't stop it for me - it still syncs automatically every time I connect the iPad.

I do have the 'prevent ipods, ipads, iphones, from syncing automatically' checked in preferences, but it still does it.

Message was edited by: lhotka

You have to plug it in and then quickly press the little cross in the top centre window until it stops trying to sync. Then you set the preferences and the Summary Tab option. Less than ideal but about the only way with multiple devices.

Before you next sync your iPad, open iTunes and go to Preferences > Devices.

You should have the latest version of iTunes if you're using an iPad, so you should see a "Prevent iPods, iPhones, and iPads from syncing automatically".

Click OK and connect your iPad. That should correct the problem.

Yep, as noted, that is already checked.

Hold down cmd+opt (possibly shift+ctrl on Windows) when connecting your iPod. Then iTunes preferences > device tab > turn off syncing iphones and ipods.