I'm looking for pictures or a diagram of the subwoofer in Audi TT
roadsters with the Bose stereo upgrade.  The picture would need to be
of the subwoofer uninstalled so that I can actually see it.

It would also be helpful to have instructions on how to remove the
subwoofer from the car - I'll pay another $30 for that if you can find
it.

Here you go my friend:
http://www.audiworld.com/news/00/01roadster/bose.shtml

The Roadster features:
1x9'' Woofer between the sears (directly behind the cupholder)
2x3.5'' Wide-Range Speaker located at the rear quarter panels
2x2'' Tweeters in each door
2x6.5'' Wide-Range Speaker in each door
1x2'' Centerfill Speaker in the dashboard

This is powered by a 5 channel amplifier/equalizer (the coupe has a 4 channel)

Take care...