OLPC Without an XO
If you want to try the OLPC operating system, but don’t have an XO-1 laptop, it’s become extremely easy to just grab a virtual machine image and boot it in VMWare. I’ve used VMWare Fusion 1.1 on Mac OS X Leopard to do this; it’s quite a bit faster than my XO-1, because I can give it more memory and set VMWare to use two cores instead of just one.