This kind of was mentioned by Richard and Don, but I thought I would spell it out explicitly. According to Jeffrey Snover, PowerShell is becoming a part of the Common Engineering Criteria (CEC) 2009 at Microsoft. Meaning that every server product released by Microsoft in their financial year 2009 (which starts July 1, 2008) needs to ship with PowerShell support.
Of course, a product can get an exemption, and of course support can vary to something as advanced as Exchange 2007 cmdlets, or as basic as PowerShell in SQL 2008, but nevertheless this is a huge success for PowerShell. After all, it was similar requirement for MOM report packs which made Operations Manager so ubiquitous.
According to Jeffrey, there are currently 20 Microsoft teams working on PowerShell support in their products, and then there are VMware, and Citrix, and Quest, and /n Software, and PowerGadgets, and many more vendors adding PowerShell to their stuff.
In my opinion, within the next couple of years this will lead to a dramatic standardization in IT manageability.