I like the idea of having more information about who I am meeting with and the company itself. I get that sort of information from a Rapportive plugin in my Google Mail accounts and it is useful. You can do a similar thing with Gist but I just haven’t spent much time with Gist or replaced Rapportive with it. I have tried to schedule meetings with a couple people using Tungle.me and the results have been a bit mixed. The interface seems a little counter-intuitive when it comes to doing stuff on the site but that keeps improving.
The service will probably be a bit more useful as more people use it too. I have about 3 or 4 contacts at the moment and those contacts aren’t regular users (or don’t seem to be). That said, the idea of an integrated and more intelligent scheduling service is very appealing.