I came across this report from fidelity (PDF) while searching around. It provides the results of a survey on change in HR groups at large companies. Some interesting stats:

• 66% of large HR departments reported “providing only basic or low-level operations, administration and transaction support, but nothing more.”
• 33% reported “that they have now moved beyond basic administrative functionality and up the corporate value chain”
• 72% of companies “not currently playing a strategic business role indicated that they are moving in that direction.”
• 97% of respondents said they are “currently undertaking, or have recently completed, HR transformation initiatives designed to allow HR to shift its focus from routine maintenance to more valued added initiatives.”
• 82% of companies said they were planning to implement a talent planning initiative such as succession, retention or career development planning.
• 68% reported that talent planning initiatives provided a “solid return on investment.”

The article also has some change management best practices that make it worth a look.