GoodCleanTech has a post on the SmartGauge in the 2011 Lincoln MKZ hybrid that add long term fuel efficiency monitoring to the real time MPG numbers.

2011 Lincoln MKZ Hybrid to Get Upgraded SmartGauge
Categories: Automotive
The upcoming 2011 Lincoln MKZ hybrid, which is based on the existing Ford Fusion hybrid, will feature an updated SmartGauge layout, AutoblogGreen reports.
The twin 4.3-inch LCDs will bracket a centrally mounted speedometer as before. But the gauges will feature a newer, green-gold design, plus long-term efficiency indicators in the form of apple blossoms.
You read that right: after the first 4-6 weeks, if you've been driving efficiently over time, the first flowers will begin to appear.
The flowers start out as little buds, and then grow into smaller and then finally larger flowers, the report said. According to Ford, earning all of the flowers on the display means you saved about $8,000 in fuel costs and 30 tons of CO2 emissions over the lifetime of the car; I imagine that last achievement will take a while.

In this instrument gauge to the right is the SmartGauge.

The idea is good, but a challenge to apply to data center efficiency monitoring in there isn't a simple metric like PUE that measure the overall efficiency of resource consumption and work done.

Lincoln did usability testing to figure out this gauge.  There are ways to develop a gauge like this for data centers, but it requires integration of the work performed by the data center which requires a visibility to the SLAs for services run in the data center.

Will the millions of Smart Meters that have a high percentage of ARM processors be the largest server count?

A server is a hw/sw system that provides services to clients that is expected to have high availability.

In computing, a server is any combination of hardware or software designed to provide services to clients. When used alone, the term typically refers to a computer which may be running a server operating system, but is also used to refer to any software or dedicated hardwarecapable of providing services.

I found information about the Smart Meter architecture which provides the services of a server.

Utility companies are starting to deploy electronic metering systems that capture and transmit usage information with the long-term goal to empower and educate users as to the real-time cost and impact of using an appliance at a particular moment in time.

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Optimized ARM Smart Meter Block Diagram

The ARM^® design philosophy is centered on low power, energy efficient design and we have spent over 10 years supporting silicon companies that need to design platforms under stringent power dissipation requirements.

ARM processors are architected to minimize current draw, both when systems are fully operational and when they are inactive, providing incredibly power efficient processing for tethered applications. While important for mobile products like phones, this is incredibly important for meters which are expected to operate for periods up to 20 years on a single battery. The highly economical approach of the embedded processors can be coupled with ARM Physical IP power management kits, to reduce the power of the complete SoC. These kits incorporate an optimized set of physical IP libraries, memoriesand standard cells to further improve the useful workload/joule metric of the complete system.

When you look at ARM's definition of what is required for an Advanced Metering Infrastructure (AMI), it sounds like a web server solution.

For the vision of AMI infrastructure to be realized, the smart meter must:

• Communicate with other intelligent appliances inside the residence or enterprise. The strategy for providing this communication path varies from country to country and in some cases region to region. Zigbee has gained significant adoption in early trials. However, both WiFi and HomePlug offer benefits for certain deployments.
• Communicate information securely across the network to preserve sensitive user information.
• Incorporate enough latent horsepower to enable the delivery of future services without the need for a truck roll.

Actually when you look at what is defined by AMI you get this in Smartphone as well.

ARM servers are showing up as the always on devices providing services to clients.

CNET News has a post on the Reality of Smart-Grid and how one company GridPoint has adapted its strategy.

Smart-grid companies feel growing pains

by Martin LaMonica

If you think utilities will swiftly adopt smart-grid technologies, consider the story of GridPoint.

Despite being only seven years old, the high-profile energy start-up has adjusted its strategy a few times and made a string of acquisitions. At first, it planned on selling home energy management systems and batteries to consumers, then shifted its focus to selling smart-grid equipment to utilities, such as software to manage home energy or charge electric cars.

Start-ups with a business model that move at the pace of Utilities.

Utilities typically negotiate with public utility commissions on how they will recoup the costs of capital investment, such as smart meters, batteries, or in-home energy displays for consumers. That investment cycle, coupled with utilities focus on reliability, means they don't have big incentives to move quickly, said Rob Day, an investor at Black Coral Capital.

Bad business model.  I don't think the VCs really thought through the problem of consumer adoption via Utility companies.