it is written in the macosx download
"Mac OS X
Snow Leopard: torrent (142 MiB)
Tiger and Leopard: OSX 32bit i386 and PowerPC torrent (153 MiB)"
I use leopard 10.5.8 on an intel processor but have no idea whether it is 32bit or not...
one more: when there will be a direct download for mac?