"I'll just get this out right now, I've fallen for Live
USB drives. Yes, and if you haven't yet, you will. What fills an
entire CD, only fills 17% of a 4GB thumb drive (8% of an 8GB, 4% of
a 16GB, 2% of a 32GB, and so on). And you don't have to throw them
away when you're done using them or if they're outdated, you just
"In contrast to Live CDs, the data contained on a Live USB can
be changed and additional data can be stored on the same device
(this is called "persistence"). You can carry your favorite
operating system, applications, configuration, and personal files
with you, making it easy to share a single system between multiple
people. Programs also start faster and run better from a USB flash
drive than from a Live CD.
"How-To: To make a Live USB all you need is a drive, the tools,
and a LiveCD ISO image file"