Asrock instant boot mobos.
http://www.custompc.co.uk/news/605172/asrock-instant-boot-loads-windows-in-four-seconds.html
I expect you can speed things up even more with a solid state HD. 64gb for about $150 175mb/s read 100mb/s write.
The idea behind Instant Boot is that it takes advantage of the S3 and S4 features of ACPI (advanced configuration and power interface), which normally enable the Sleep/Standby and Hibernation modes in Windows respectively. However, by calling them at different times in the boot-up and shutdown process, Instant Boot enables you to boot up to your Windows desktop in three to four seconds, even after a proper Shut Down.
http://www.custompc.co.uk/news/605172/asrock-instant-boot-loads-windows-in-four-seconds.html
I expect you can speed things up even more with a solid state HD. 64gb for about $150 175mb/s read 100mb/s write.