Great job, really, Dolphin 7 will be a huge jump for communities softwares.

Please test it also in IE6, now doesn't look well ;)

I don't know if you aready work on this but I would like to propose you some new features like:

1. Userpoints for adding articles, polls, ads, pictures, videos etc. With achieved points, user get coupons then buy products from an online store included in Dolphin.
2. Widget box integration
3. External applications support, for example a better forum (maybe phpbb3/smf/vb see more bridge/API ?) or Flickr, Twitter etc
4. Openstreet Map, Yahoo, Live Earth integration - allow users to choose between map layers, not everyone want Google
5. Option to easily invite friends from other social networks
6. Multiplayer games
7. Wiki

Thank you