Read this : http://unifi.athena.my/ddwrt_guide.php

I have also successfully converted my DIR 615 into a DD WRT modem. Kinda tricky though, because it requires at least some basic knowledge of networking that the guide above did not specify.

BTW, how do you guys QoS a uTorrent? I am trying to assign it to bulk so as not to kacau my normal surfing. I assigned it to the name "bittorrent" in Service Name, but I don't think it is working.