The OpenSolaris 2008.05 Live CD makes it simple to boot to a fully functional desktop environment, including Firefox and Thunderbird, without the need to install onto your system. After familiarizing yourself with the OpenSolaris environment, you can then choose to install it onto your disk. Once installed, you can connect to the OpenSolaris Package Repository to install additional software at OpenOffice.org
Not sure if this has been posted before, sorry if it has.
Cool to see a change from linux livecds