The thing I love about linux livecd’s is the ability to try before you make much of a commitment. You can boot, test, evaluate, and then reboot and be back at your usual desktop as if nothing has happened. (With emulators like QEMU and VMWare you don’t even have to reboot the PC.) There are a lot of Developer tools under linux, but until now I haven’t been aware of a distribution (livecd or otherwise) that is emphasizing those.