Tell me about it. I just got a comcast connection a couple of weeks ago and comcast has been, seemingly at random, kicking me into a captive portal that tries to scare you into installing their software.

The worst part is that it only keeps me in the captive portal just short enough that I haven't been compelled to figure out how to make dd-wrt stop it yet. I'll be sitting there putzing around on the Internet, try to google something and hit their portal. A few refreshes later and I'll be back in business.