Amir told me that he posted a two part series that covers new features of Entourage 2008 on his blog. Part 2 talks quite a bit about Exchange integration too so I figured people would be interested:
Entourage 2008 – New Features (Part I)
Entourage 2008 – New Features (Part II)
Read more at source: http://msexchangeteam.com/archive/2008/02/06/448063.aspx