Mother of all Web 2.0 sites

I started blogging again a few days ago and was looking at all different things or so called 'kits' required to make your site up to date. I had to search or dig(g) through different sites to come up with ideas on how to make your site more viewable. Digg it, del.icio.us are some of the buzzwords that I grasped recently.
After reviewing them slowly, I have now started to adapt to them. Some of the things I've been observing is that all sites required a login with a profile. Could there be just ONE site that will take care of everything for me. I'm tired of creating profiles over and over again !
What we want is a mother of all Web 2.0 components ! Please share your opinions