[guylhem]

Quite interesting - more than foursquare maybe. I don't really care where people are right now - unless they have just arrived and I can still join them. In any case, that's a short window of opportunity.

However knowing where they plan to go means it'll be easier to plan in advance and join them.

Facebook and the calendar / groupware software already made that possible, but not so easy. Hopefully forecast will fix that.

No API however.

[edash]

I agree. Whenever I defend Foursquare to non-users, I use the "friends sometimes come meet me" explanation.

Forecast solves this in a more practical way by providing my friends advanced notice. If I had to choose between the two - I'd much rather keep Forecast.