I'm in the process of testing this installation, adding some test users, and asking people to critique the site. Something I've noticed, and has been confirmed by others, is that the navigation is not intuitive. The top navbar is set off from the design, and doesn't have all of the links that you'd want. An example of what I'd expect would be:
Home | Edit Profile | Search Users | Search Communities
Something like that.
Keywords: elgg, navigation, web design