T-Mobile rate limits your data connection

I recently returned from a week long business trip. My hotel room's location relavent to the router produced a poor internet experience so I decided to move my connection to my tethered Samsung Vibrant connection over the Tmo network. I received great (mobile) speeds typically resulting in 200-300kb/s rates. During the trip I used around 10 gigabytes of download data while watching some netflix films.

Yesterday I received this text message: Free T-Mobile Message: Due to the amount of data you have used this billing cycle, your data speed will be slowed for the remainder of the cycle.

I don't know if this is new or not, but I wanted to share so people would be aware. I'm a long time T-mobile customer that is pleased with the serviced for over 8 years, I'm not overly upset with this but just want to inform people of this policy in effect.