It isn’t the digital divide that most people refer to, but there has been a traditional advantage for Democrats in their willingness and ability to use online tools. The way I’ve generally thought about this is to compare it to theater and the arts. How many Republicans do you encounter who work as prop-artists or set designers? How many conservative painters are there? The vast majority of truly creative people are liberal in their outlook, especially on social issues. You do see the occasional Republican actor or comedian, but they serve to remind us how truly isolated they are (and, generally, how untalented and unfunny).
Creative use of the internet isn’t much different than any other creative endeavor. So, Republicans are late adopters and their use is mainly derivative and second-rate. I mean, look at the conservative blogosphere. Do they have attractive, innovative web designs?