lost passcode, ipad is disabled. How do I get back in?

FORCE IPAD INTO RECOVERY MODE

1. Turn off iPad

2. Turn on computer and launch iTune (make sure you have the latest version of iTune)

3. Plug USB cable into computer's USB port

4. Hold Home button down and plug the other end of cable into docking port. Do not release button until you see picture of iTune and plug.

5. Release Home button.

ON COMPUTER

6. iTune has detected iPad in recovery mode. You must restore this iPad before it can be used with iTune.

7. Select "Restore iPad"...

Note: Data will be lost

Do not release Home button until you see the image below.

I'm pretty sure the only way to get back in is resetting your iPad. (Factory Settings)

"Resetting to factory settings will restore your iPad to "out of the box" condition. If you do not restore from a backup at the end of the restore process, you will have to enter all of your personalized settings again and your email accounts.

Resetting to factory settings removes all settings that you put onto the device. One of your settings may have caused the problem as well so this will be like starting all over again with a brand new iPad when you rset to factory settings."

http://support.apple.com/kb/ht1414

Click here for more details about factory resets.