If you're a Windows or a Linux user, and you have a flash drive, or external hd, let me point out there's no need to keep buying blank CD's and burning Linux on each one, cause I just found this program called UNetbootin (It's a portable application), and it does all the work for you, all you need is an .iso image of the OS you want to run off the flash drive, or external hd then you can burn it to the drive, and boot into the OS from your flash drive, and you're good to go.

This program without a doubt will save you time, and money, and it's definitely worth a try.

SLAX is my favorite flashdrive distribution, though I rarely use Live CDs.

Two other Live CDs of note are Dyne:bolic with its excellent GIMP support out-of-the-box, and Puppy Arcade which has the ability to turn doorstop computers into retro gaming machines.

I have Linux Mint 10 running from a 2gb SD card. I can even save changes to the card, i.e. desktop settings, downloaded packages, documents, etc. Started on a 1gb usb drive and working my way up to make my system completely portable. I'm in the process of moving to a larger capacity SD card. Linux is so cool.

I use the Startup creater from 1 live CD to make USB installs of others. Doesn't always work though.
I have a 4GB drive that has seen more distros then I. Literally, since sometimes it won't start up. I also use it on my regular laptop, there is no space on it for a double boot so I use the live USB.

Fedora provides an app called 'Fedora LiveUSB Creator" which can create Fedora Live on a memory stick as small as 1gig. I've been using it in place of the Live CD for installation, where applicable.

Ubuntu is no doubt my personal fav, I just wanted to give gOS a try, but to be quite honest I don't really like it, and I'm gonna try the Alpha version of Ubuntu 11.04.

I dual booted before, but the idiot at papa chips who fixed my computer wiped the D drive, and deleted the partition where I had Linux installed deleted it so I can't dual boot Linux, cause I don't have enough space anymore, but flash drives are a life saver

I ran Fedora on my old PS3 before my crib got robbed, and I thought it was ok, didn't like the GUI, but that can be customizable not sure if I wanna run Linux on my PS3 again cause of space for gaming.

Just my opinion but you should really avoid alphas (or betas) of Linux distros, unless you're a tester. You're asking for all sorts of trouble there. By their very nature, alphas and betas are constantly breaking. Even when the final release occurs, it still takes time to get the kinks worked out.

I'm certainly not recommending any one distro over another. Each distro has pros and cons. It's all about what you like and what you've had the best success with. For me, it's Fedora.

Yeah I'm just testing it, as it is in Alpha state, I looked a reviews of it, but now I wanna see for myself how it works and reacts, and then of course wipe it clean, and put whatever else I feel on my flash drive.