I came across correlate.us via Digg and knew it had Lifestreaming written all over it. I like the simple approach with regards to adding & displaying feeds. The home page provides an aggregate view of all users activity along with stats and a tagcloud. Too bad it currently only supports four feeds including del.icio.us, digg, flickr, and twitter. It also is offered as a Facebook application.
Here’s a quote from the blog about the inspiration for creating the site:
Welcome to my little side project! This site sprang forth out of my frustration with both social networks and my increasingly disparate collection of online activity. I wondered to myself why the social networking sites were such silos. Why should I post my photos, blog entries, interesting websites, etc. when I already have a flickr/delicious/digg/twitter account? It just didnâ€™t make sense.
My page is here
Update 6/3/07 – They just added support for Last.fm