Your life, on the line - Plurk.com. Discover and Share. 35 Ways to Stream Your Life - ReadWriteWeb. It's a pretty good bet that if you're not making a Twitter or Facebook application, you're probably making a lifestreaming application.
Okay, so not everyone is into lifestreaming, but it is one of the hottest areas for development out there, and there are an overwhelming amount of services offering a way to aggregate all the little bits of your online life (which, for the purpose of this post, is the definition of lifestreaming that we'll use). Richard MacManus wrote an excellent primer on lifestreaming in January, but we touched on just 5 such services.