Most of those Older Pc's cant boot from a USB stick. It's only been the past 3 years that booting from a usb drive has become the norm, before that it was an oddity.
There is a boot helper CD for older computers like this. The beauty is that the OS on the computer is untouched, since Sugar runs from memory not the hard drive. Additionally, all progress is saved to the USB drive, so the stick is portable from computer to computer.
"The firm is working with four mobile manufacturers — Samsung, HTC, Motorola and LG — but a Google branded phone was not announced.
Google's system will be based on computer code that can be openly distributed among programmers, allowing them to build new applications.
A development tool kit for working on the new platform will be released next week
"They that can give up essential liberty to obtain a little temporary saftey deserve neither liberty not saftey." -- Benjamin Franklin, 1759