Yes, I will need to get more serious about offering MEANINGFUL tags and then maybe ask @yongfook for some way for people to subscribe to tag channels (assuming it isn't already in the API, which I haven't completely parsed just yet). It won't surprise me to find his foresight at least that comprehensive and thorough.
In other news, maybe once people see an @scobleizer equivalent firehose -- just @scobleizer, across all services, in one firehose feed beholden to no one but himself -- they will begin to understand just what one of our most extraordinary colleagues has been attempting to communicate with us mortals. I know he's been trying to do that with Friendfeed, but unfortunately, even that great service is one among many.
Ultimately, the only one true aggregation point for humans is The Individual; aka, The Node in context of global cognition grid.