Densha Otoko [電車男] Not quite up to the real thing... [Rating: 9/10] ... but still good nonetheless. To be honest, though, I think I prefer the real Train Man story -- reading the posts as they happened gives you a sense of suspense like nothing any show could give. That fact that it's real life just makes it better.
If any of you are interested, head on over to the Project Densha website: http://www.rinji.tv/densha/ It's the English translation project of the actual BBS postings by the real Train Man himself, complete with replies from the 2ch community and ASCII art. ^^