[maxmsp] 64 bit?

Macs with Core 2 Duos or Xeon processors are 64 bit and Leopard has native 64 bit support, so there could be some performance gains by upgrading to Leopard assuming applications are written to take advantage of 64 bit processing, right? 

Is there/will there be any way to take advantage of 64 bit processors in Max? What about any other popular audio software? 

Just trying to figure out if this may be a good reason to upgrade.

-Adam