Last weekend, I was in Barcelona and two friends of mine happened to be there as well, one from New York, the other from Vancouver. Just by chance, I was able to meet one of them, but it made me think about what applications might be out there to assist with promoting 'coincident' meetings. So, I emailed Boris Mann (the one i missed) and he told me about Dopplr. Seems to be doing that kind of job. So that's one of my new 2.0 environments!