NBC's Crossing Jordan has an interesting concept going on right now. It seems it was started a while ago but one of their forensic characters, Nigel,(played by Steve Valentine) is "blogging".
Yes, doesn't that sound fake? But what's neat about this is that it's all in line with a case being done on the series and the actual blog is broken up with all bits and pieces of what's going on in the case. (check out the files area for interesting links)
What's even more interesting is that now you've got viewers adding lots of comments on each post as they read through it.
Jeez - imagine what would have happened if Paramount had blogged the Star Trek Captain's Log - if you think Trekkers were fanatic now (being able to raise 3 million dollars to save a show is no small feat), imagine that scenario!!!