Recently I’ve needed to use Live CDs for a client, when nothing could be saved on disk. I’ve used:
* Knoppix (best)
* Xubuntu (has problems with the wireless card in this laptop)
* Tails (security overkill)
It is time to take a look at Puppy again, just to see if it is compatible with the wireless card in this server.
Incidentally, the idea of routinely using a hard-drive-free Linux live CD is becoming more appealing. The idea is to have a computer with no connection between current and past sessions. If you are dealing with information covered by privacy regulations, like student info, health information, or financial information, this can help you meet regulations in short interactions with websites.