I've checked this out only for my own home and haven't had time to check out the included maps (which require a BitTorrent client to download and Google Earth to use), but a new online DTV (also analog) signal strength predictor is available at TV Fool. Having written and published prediction software based on the Longley-Rice method in the past and evaluating several others, I can testify that there is no perfect implementation of signal strength prediction, but this one looks like it does a much better job incorporating the effects of terrain than does the CEA's AntennaWeb offering. I'm looking forward to checking it out more later this week. I'm sure it will be a useful tool for our station technical staff in advising viewers about their DTV receive options. You might point "advanced viewers" to it directly, but the site is not as consumer-oriented as is AntennaWeb.
Thanks to Dale Kelly on the OpenDTV list for the tip. --Dennis