What’s the deal you may ask, well there is a lot of new cool features in it except from the usual bugfixes.
One most requested feature is the ability to make backup of Exchange with built in tools in windows. With Service Pack 2 you get this with the Exchange Volume snapshot backup snap-in for Windows Server backup.
This is only one feature of many that are added in SP2. Read more at the You had me at EHLO blog site
The Only sad thing is that you have to wait until after the summer to get it.