Andrew Baio (creator of upcoming.org) just told me that the upcoming API now has full tag support. I’m now displaying tags on the event feed here.

The addition of tags+API definitely was the tipping point — now I’m really using the service. I’ve got several iCal subscriptions; Stockholm, Helsinki, and Berlin.

Couple of things; The hierarchy of metros should probably be flat altogether, editing of events could be more wikified, the fixed event categories should be dropped in favor of folksonomy. All in all: Kudos to Andrew!