Over a year ago, Marc Canter planted his flag on the term "digital lifestyle aggregation" or DLA. When I first heard of DLA, the concept rang a bit hollow but thinking about del.icio.us, Flickr, allconsuming, and audioscrobbler, the pieces are there. All of these applications generate webfeeds so they could be slurped into your generic RSS aggregator, but I think most of these are subtly incorrect, and point to where I'd tweak DLA.
What we really want is Sociable Lifestyle Aggregators for doing DLA. Not only do we want to monitor and aggregate our personal digital lifestyles, we want to have good mechanisms for selective and controlled revelation. Aggregators with buddy lists could be a baby step, but aggregators equally or priimarily designed for social activities are a whole different beast. The issues are a little deeper than "river of news" versus "e-mail".