As Piers says, with Edward Zwick and Marshall Herskovitz's Quarterlife also making the journey from web the network TV, this is starting to look like a trend.
Update: American Screenwriter and blogger, John August, also believes the future is online. Although he sees his new show as web-only.
The project is financed outside the studio system, with some of that much-fabled internet money. It has actors you recognize, and it probably could be a TV show — but it won’t. There’s near-consensus that in the next year or two, one of the web shows will really take off and change the game. I can almost guarantee you it won’t be ours. We may never see the light of day. But it’s the right time to be experimenting: with tone, with format, with economic model.