If I understand your question correctly, are you asking if a "live" version of Mac OS X is available that will boot on an Intel based system? If so, the answer is no. Mac OS X is a proprietary software that (at present) can only run on Power PC based computers. Also, the user's license for those who purchase Mac OS X prohibits anyone from using it on anything but "Apple labled" hardware.

Having said that, there are rumours that Apple -may- release an Intel compatible version of OS X... but this is only a rumour. If this ever happens, it is -extremely- unlikely it will be a "live CD", since OS-X is just too big.

There is PearPC, which is a PowerPC emulator that allows you to run most versions of OS X under Windoze and Linux, but you take a big performance hit and not everything works. PearPC is free, but you'll have to still buy a copy of OS X. You'll also have to set aside a 6-8 gb partition -just- for OS X... not exactly a live CD

Nope, if you want a "live CD" your option is Linux, and the best live CD's (IMHO) are Knoppix and Kanotix (nearly identical twins BTW). You can dress up your destop so it -looks- like OSX, if that interests you, but the engine beneath the tiger skin will still be Linux.