For those of you who aren't reading Mac Mojo (and why aren't you?), I just posted about the Entourage EWS beta feedback so far.
The quote that the team seems to like the best is the Obama quote. Of course, we do all live on the left coast, so that's probably not too surprising.
Entourage EWS has been a long time coming. It's such a relief for the team to be hearing great things about it. It's not perfect -- there's issues, and it doesn't give us all the Exchange functionality that we want. But it's a big step in the right direction, and people seem to recognise that.
If you haven't yet checked out the beta, and if you're on Exchange 2007 SP1 RU4 or later, consider giving it a go. For more details about the beta, here's a couple of posts from me about it:
Edited on 17 August 2009: The final version of Entourage for Web Services is now available, so you should update!
Ballpark figure, when will Microsoft give us full Exchange functionality?
As you know, this isn't a question I can answer here. Work with your Microsoft account rep to learn more about our roadmap.