Disaster Recovery is the buzz word . It was real costly and had lotta overheads till ystrday but now whatever softwares are being roll out DR is considered a core requirement . Same applies to exchange 2010 , apart from being more efficient and having like a million new gems it has also got a DR option . Well I am in a team and will be working on it soon . so I will keep all posted.

prerequisites : need to know somethin about what all has happned.