Ben, so far I don't know of any other product that offers this, it's just what I want (I'm greedy). Elgg works very well when everyone else is using it, particularly the SNS. However, most people are using other applications, like WordPress for Blogging or Linked-In for SNS. These two may be options for integration. Some of the Google apps would be great too, but that may be a pipe dream.

I'm not saying that Elgg lacks something that others have, just that more integration may add more users to the community. I don't know that many full-time users of Elgg and see integration as a way to increase the size of the community.