More fun with Linux: on a system with ATX powersupply and a networkcard that supports wake-on-lan get a recent kernel and ethtool and then add a line in the script that brings down your network interfaces to configure wake-on-lan on the card (after the 'down' part). Get the ether-wake program (from scyld.com which also has other great linux network drivers). And then: wake-up call for your systems!
Fun with Linux: on a system with an ATX powersupply and the right kind of systemboard, enable ACPI modules (ospm_busmgr ospm_system ospm_button ospm_processor), get and install acpid and now the powerbutton on the front of your computer also works as immediate shutdown button (just like a Sun Ultra 10)
Added an explanation of how I use dynamic dns for my ever changing cablemodem IP. Available as Using Dynamic DNS for your dynamic IP micro-howto.