I think it's very important to grab a tiny USB flash drive: http://www.verbatim.com.au/en_AU/products/flash-media/usb-drives/44049/store-n-go-micro-usb-drive-black-8gb And install Ubuntu on it. Unbootable computer? Need to repartition, copy some data or do a backup, maybe some quick hacking or general work but all you've got are crappy Windows machines? You can fit a very usable desktop and development environment that is quick to boot in that tiny usb flash drive.