For people who work with a real OS... OpenSolaris build 100 now supports fastboot.
The minute i installed b100 i found great use for it. Its typical that once i install a lab system for development, i always have to set proper network params, hostname and such to work with DHCP blah blah... and then i would need to reboot.
deciced to give it a try and reboot -f , got the prompt (including X) back in about 7-10 secs) which was fantastic...
Thank you Sherrie from sun for providing this neat feature.. now only if you extend to support panic reboots would be fantastic.
Check the manpage for reboot for additional options.
Great work Sherrie!