Can I sync Address Book to iCloud on Snow Leopard? I've updated my iPhone to iOS 5, but my Mac(s) are still on OS X 10.6 Snow Leopard. 

Syncing Contacts to iCloud is enabled in iPhone settings. Now, I was wondering is it possible to make Address Book on my Mac (running 10.6) to sync with iCloud too? Or is this something that's only available in 10.7 Lion?

(Sorry if this question seems too basic or whatever. I haven't been paying much attention to Lion/iCloud.)
No. iCloud requires OS X 10.7.2., aka “Lion”.