spore is out for both mac and pc. (go macintosh!)
If it is the Mac version of Spore and the Mac has an Intel processor (1.7GHz Core 2 Duo or higher) then the disc will work. If it is a Windows disc then it will not work unless the Mac is running Windows.
For Mac, or PC?
not yet
you cant
No, running spore on a mac will not make it slow, but not meeting the system requirements will make it do close to nothing correctly.
The full game of spore is only available on PC and mac, sorry.
yes
yes
you can download it from here http://www.nowtorrents.com/torrents/spore-serial-number-generator.html
Yes and no, there will be a new spore expansion pack that's coming out in 2011.
no but they do also have it for the Mac