I'm not sure how many would be affected by this. The article states "2%", but there is no mention of the impact on AVS Forum members. 
Highlights:
*New provision that allows AT&T to limit the online activities of heavy users. Customers who hog bandwidth by downloading high-definition movies or vast quantities of digital music...
*AT&T says it will impose caps on data use or limit a customer's download speed or even impose additional fees if they're slurping too much online soup.
*This is targeting the top 2% of people who use about 20% of the bandwidth."
*AT&T will crack down on any DSL user who exceeds 150 gigabytes per month, which is the rough equivalent of downloading 50 high-definition movies. Customers who receive the company's U-verse broadband service will have a cap of 250 gigabytes.
The rest of the article:
Here.

Highlights:
*New provision that allows AT&T to limit the online activities of heavy users. Customers who hog bandwidth by downloading high-definition movies or vast quantities of digital music...
*AT&T says it will impose caps on data use or limit a customer's download speed or even impose additional fees if they're slurping too much online soup.
*This is targeting the top 2% of people who use about 20% of the bandwidth."
*AT&T will crack down on any DSL user who exceeds 150 gigabytes per month, which is the rough equivalent of downloading 50 high-definition movies. Customers who receive the company's U-verse broadband service will have a cap of 250 gigabytes.
The rest of the article:
Here.

















I have been looking for other dsl providers for 2 yrs and so far the only one that offers it besides AT&T is earthlink.ATM earthlink has no plans to cap the service so they may be an option for others as well.