http://www.polidata.usI'm not sure when their data is from, but looking at Warren County, OH it appears to be prior to the adding of provisionals.
It is a useful site for comparing with previous year's results and in examining the OH data, I made the following observations:
Kerry underperformed Gore in 23 of the 88 counties and equalled his percentage in two. The underperform counties all went to Bush. In the counties where Kerry's percentage equalled Gore's, Bush won one (Union) and Kerry the other (Belmont).
The thing that struck me about Belmont was Bush's improvement over 2000, from 41.9% to 47%. The third party vote (presumably almost all Nader) was 5.1% in 2000. Even though we aren't dealing with the exact same voter population, one would reasonably expect Kerry to have captured the bulk of that Nader vote while holding on to the Gore voters.
Two counties flipped. Gore had won Clark, but Bush won it this year even though Kerry's percentage improved, from 48.6 to 48.8. Bush's percentage this year was 51.2 vs. 48.1 in 2000. The "other" (Nader) vote in 2000 was 3.3%.
Stark County was won by Kerry while having been lost by Gore. The vote breakdown there evolved more as expected, with Kerry being the beneficiary in the absence of a third party challenge.