We are planning a new tariff for home users, called Home::1, and we hope to launch this new tariff by Christmas.
Details are on http://aa.net.uk/broadband-home1.html
The details are not quite finalised yet. We are however interested in a small number of customers that would like to change to the new tariff. We'd switch you to this retropectively for November, which helps us test the change over to start of new month, and the billing, and (if anyone is close to their quota) the top-up system.
Contact the trials team on the email address on that web page if interested.