Since I booted my DVD drive months and months ago to fit in another hard drive in its place, I have now no means to boot my computer if both hard drives fail. The solution is to create a memory stick with the installation of Snow Leopard for use in emergencies. Instead of me rambling on how to do this, another dude on the internet has a nice little guide on how to perform this operation. Except that his piece is about making the 6GB installer DVD down on a single layer DVD rather than a dual layer. But this works for memory-sticks too, in case you don't have one that can fit more than 4GB.
Instead of burning the disc image in the last step to a DVD, you'd simply carbon copy it to the memory stick. Remember to format the memory stick with a GUID partition scheme, in order to make sure that Intel Mac's can boot from it.
The guide can be found here:
http://tonymacx86.blogspot.com/2010/01/fit-mac-os-x-snow-leopard-on-single.html
