NimbleX : Portable Linux That's Ready to Rock
How much awesome can you cram into a 200MB live CD? A whole lot. NimbleX comes with 550 packages preinstalled, and you'll find the usual Linux apps here: Firefox, K3B, XMMS, MPlayer, Gimp, Kopete, Transmission, Klam AV, and K Office, to name a few. Boot times are wicked fast, even from CD, and installation to a hard drive or USB flash drive is dead simple.
Desktop performance is equally impressive, even on our shabbily-equipped VirtualBox setup (256MB memory, 8MB video, 8GB hard drive). On that note, it's worth mentioning that NimbleX also comes with VirtualBox installed just in case you decide you want to get Windows XP running in it.
NimbleX is built on Slackware, which means you'll be running one of the most solid, secure distros out there (here come the arguments from hardcore Linux users). Hardware support is excellent, and Bluetooth works out-of-the-box. Don't like the default KDE 4 environment? Enlightenment 17, Enlightenment 16, EDE, IceWM, Fluxbox, Openbox and TWM are also included.
If that's not enough, you can customize your own ISO on their website. Check a few boxes to specify what you want to do with your install, and you're given tons of optional components to add to your ISO. OpenOffice, Wine, Blender - you name it, you can add it. It's an unbelievably cool way to get your hands on a Linux live CD that has exactly the apps you want.
For 200MB, the average person looking to try Linux will be hard pressed to find a nicer distro.