While you cannot filter based off of speed on any of the cable/dsl routers out there you can do some filtering with DLink. About a year ago I noticed that my roommate was hogging up MY bandwidth, and gosh darnit I didn't want to lag as much in games (I paid for it). He was torrenting. So what I did was setup a firewall option under DLink's firewall settings to ONLY allow him access to bittorrent when I wouldn't be needing the connection. The result was that he was utterly confused. He was complaining that it took so long to download at times, but he couldn't figure it out because it *would* eventually get going. Whenever he'd asked I'd just shrug and say that perhaps that seeder wasn't uploading to him, and he'd blame it on the seeder. ;-)