This is true and thanks for the feedback. Do you (or anyone else reading) have any ideas for things that all talented developers would want to list on their profiles that we don't have on Careers yet? Thanks again!
While filling out my profile it struck me that I'd love a friend finding service: Find me programmers within 50 miles of my stated location who share interests and experiences in some of the many tags I chose for myself. I'd like to meet them and have a beer.
The key here is that StackExchange has a high usage rate amongst programmers and it allows me to register interests in technologies that I don't have public source code for.
Facebook has a nice social graph but no angle on programmer socialization. Github's API can let you infer which open source languages I dabble in, but not at all what I do at my day job. Good luck to you though, I'd love to see the product.