NickCharles said:Yes, absolutely:
Enhanced 64-bit Support
Leopard delivers 64-bit power in one, universal OS. Now Cocoa and Carbon application frameworks, as well as graphics, scripting, and the rest of the system are all 64-bit. Leopard delivers 64-bit power to both Intel- and PowerPC-based Macs, so you dont have to install separate applications for different machines. Theres only one version of Mac OS X, so you dont need to maintain separate operating systems for different uses.
Bridge the Generation Gap
Now that the entire operating system is 64-bit, you can take full advantage of the Xeon chip in Mac Pro and Xserve. You get more processing power at up to 3.0GHz, without limiting your programs to command-line applications, servers, and computation engines. From G3 to Xeon, from MacBook to Xserve, there is just one Leopard.
Wait. Does this mean that the Leopard doesn't support current MBP or MB? the ones that use 32 bit Yonah based Core Duo CPU.