Last month, I wrote I would not post the sql connector's source code until it was a little more functional. Guess what? I changed my mind: you can find all the code at http://code.google.com/p/gae-sqlite/.
From the code.google.com project page:
This is a module that will allow you to run Google's App Engine development server with an SQLite backend. The concept is intended to be generic enough that other databases (mysql, SQL Server, Oracle...) can follow with only minimal modifications.