Green Opportunities/Practices:

Performance Tuning

Query Optimization

Index Optimization

Data and Log Tracking on Separate Physical Drives

Disk Defragmentation Frequently

Any Others?  Join the Discussion at Facebook

Why In Conjunction with IT Pros:

Without virtualization, the first 3 will not see as large an increase as that achieved with virtualization.

The other 2 options will see benefits irrespective of virtualization.