I finished watching the entire Densha Otoko series in the last couple of days and I really enjoyed it, although at some times it was definitely cheesy and overly dramatic. The show was based on a real story of an anime obsessed nerd (otaku) who's chivalry, albeit with shaking knees, saves a woman on a train from a drunken old pervert. She thanks him and asks for his address which he gives her and then he turns to a highly popular japanese message board for advice on what to do. The ensuing 10 episodes follow the young nerd as he is transformed from a geek rife with Ota reek, into a dashing and bumbling hero who wins the heart and hand of a "normal" woman.
About half way through the series he decides to part with his Otaku ways and become a "normal" person, which I thought didn't quite give a healthy message to people (you must have no personal identity!), but towards the end he realizes that he will always be an Otaku and hopes that his love will accept him for who he is, which she does.
I especially like the parts when he is conversing on the BBS in which he interacts with hundreds of people throughout japan and abroad including one of my favorite jp tv personalities Nasubi.
The show gives an interesting look into how the japanese public feel about nerdy people and how they are really shunned by society. It is interesting how nerds are treated differently in the US and how nerds have become somewhat cool in the last 10 years here. Here is a link to the bittorrent of the series (complete with english subtitles) if you are interested in checking it out. I guess there is also a movie out there somewhere which I'll have to check out as well.