Here's another simple service that I like - MeeID. Pick a name, add a picture, write up to ten lines about yourself. Each line can be a link, but doesn't have to be. At least some HTML is allowed.
That's about it. You can link your profile to others, but even this feature is pretty limited. The obvious use is to have your MeeID page be a central reference point. It's the link you stick in your Twitter bio, or on your moo card.
(I can be found at http://www.meeid.com/foomandoonian/)