After many frustrations, I seem to be back up again (if you hadn't noticed, my internet connection has been really flaky the last several days. I replaced an aging router today that seemed to be on the fritz. The upside is that I now have 54Mbps 802.11g wireless access in my house. Whoo hoo. Hopefully this is the end of the trouble.
My new router also natively supports dynamic dns registration, so I don't have to run the registration client on my pc anymore. Me likie.