Android Tips and Tricks.

Enter wrong pattern 5 times and wait for 30 seconds.
Select “Forgot pattern” and enter your gmail account username and password.
Make sure you use the same account that was used to activate the G1 and double check the password by logging in to that account in a browser.
If you don’t have access to the original Gmail account, you will need to do a hard reset and loose your settings and apps on the phone. The data on the memory card will not be wiped though.