Write Twitter Autoresponder program that can be sold or given to Twitter users.
The program should be downloadable, and complete from download and installation including:
1. Auto follow of my site
2. Auto message such as "I just downloaded the #1 Autoresponder from..."
There must also be a way to charge a fee, or monthly service charge, via Paypal.
Bonus if you can bundle other Twitter features/programs/Add-ons.