The network usage before the cap was around 20-25 Mbps normally, and under the cap, there should be no effects. But, the cap would be noticible around the 70 Mbps peaks we saw last year. That's why we put it in your rooms in the first place. Just be careful. You can do low-bandwidth activities as much as you want.
Web surfing takes a bit more but is still non-intensive.
Downloading large files, like MP3's of CDs, whole feature-length motion pictures, or porn, takes up a significantly more bandwidth. So try not to do stuff like that regularly.