Remember a time when every single software update you made to your computer's OS or applications required a complete reboot of the system? Computers are still far from perfect, but you can relive those annoying and constant operating system restarts of yesteryear, and appreciate how far things have come, over at The Restart Page.
Everything from classic versions of OS X, to QNX, to every flavour of Windows you can imagine is there. Including Windows XP, which might be officially dead, according to Microsoft, but will live on forever on this site. [The Restart Page via The Awesomer]