Damn Small Linux is really a damn small linux distribution till date. Amazingly the entire ISO image could fit in a pen drive or in a small compact disk because the total size of theISO is only 50 mb. It acts as live CD meaning that the OS can boot from any system withoutinstalling in the hard drive. DSL can even be operated from within Windows also. So you cancarry the entire OS with you and it can fit in your wallet...