Most sites will be updating their sites constantly. A few will put up another video every half hour. This will not do.
Liz Gannes at http://newteevee.com/ says:
On Election Day, ABC News will offer livestreams of its own newscast, the scene at both the McCain and Obama campaigns’ headquarters, and a stream of roving reporters in battleground states. It will also offer a live results map, searchable exit polling data, liveblogging and results via SMS. CBS News will be offering county-by-county results updated every minute, liveblogging, as well as a simulcast of its TV coverage, starting at 6:30 p.m. EDT. Around 2 a.m. EDT, Katie Couric will host a live webcast on CBSNews.com and CNET.com to address participants’ questions.
full text at http://newteevee.com/2008/10/28/where-to-track-election-night-online/
I'd like to already have the links ready but we'll all have to settle for being pointed at the overall website.