Isn't Lion required for Photo Stream in iPhoto or for iCloud support for keeping Bookmarks, Contacts and Calendar synced with your iDevice and your Mac?
Snow Leopard 10.6.9 should be out as well for those that do not want Lion.
Nope stopped selling SL the day Lion was released.
I guess, but in general, 99% of the features do not require a Mac.
As a MobilMe subscriber bookmark, address book & calendar syncing IS 99% of the features that I need from iCloud and no I don't want/can't run Lion.
That's what iCloud is for.