What crap--I have a Core Duo MacBook (early 2006) that can't update to Lion (need Core 2 Duo) but is okay running iPhoto 9.2. Why can't Photostream be supported? Or some of the other iCloud features such as calendar synching?
Apple really screwed up on this issue--nothing talked about these features being Lion only. If you go onto Apple's site, there's still no mention of lack of support for Snow Leopard; internal store documents-only demonstrates a lack of openness with customers. And this extends to the need for a control panel for iCloud, which is also missing.
Crazy that Apple won't support it's own 2-year-old OS with iCloud but will support the 5-year-old Windows Vista.
There was talk in August of a 10.6.9 release supporting iCloud, but nothing's been mentioned recently.