Virtualization strategies for disaster recovery?

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I invite all of you to discuss the following subject.

The virtualization of IT environments today is the main subject in a great range of companies around the world.
This is one of the most quoted IT solution for a great range of companies, more specifically for their 2009 budget.
Regardless of the reason for the investment of virtual environments, nowadays  some companies are utilizing virtualization in their alternative sites, therefore the strategies of DRP (Disaster Recovery Plan) are changing. Based on these facts,  lets open a discussion group about the following question:

How are virtual environments being utilized as strategies for disaster recovery and/or BCP?