I can't claim to have met anyone in person, but I have developed at least a little bit of a relationship with several members of LT. At least one person who lives in my neighborhood and I have been planning for a while to get together for coffee one afternoon (okay, it's been months and we haven't met up, but we have hopes). Several people and I have traded books we've found, either on our home shelves or in shops, of which we thought the other person would make better use. Finally, I've found a few LT members on other sites (Ravelry, KnittyBoard, BookMooch, primarily) and continued the friending there to expand past our literary obsessions.
I'd be interested in LT meet-ups in my area, though my crazy scheduling might preclude me from actually attending. Thingamabrarians overall just seem to be my kind of people far more than the general population would provide statistically. I don't feel compelled to keep my online and my real lives separate.