I definitely like the idea of Groups as this will help with the social networking of a site. Being able to have people associate with each other on their own is a very valuable feature.
In addition, expanded profiles - pictures, etc. - would be cool. I'm sure a lot of this could be programmed separately, but if it's added as core functionality, with the ability to turn different aspects on or off (videos, audio) or limit (such as 6 pictures), that would be very cool.
A blog feature would be very cool, even though you can integrate a Wordpress or other blog into the template. That way, the owner of the site can expand on their own, without using the digg-like article postings and getting these lost in the general hub-bub of the site. Video and audio postings would be nice in the blog.






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