I often have a problem that photos taken with my iPhone (running OS7, but happened on OS6, too) do not migrate via iCloud to iPhoto. I've been manually e-mailing the missing ones, but this is ridiculous -- it's supposed to be seamless, and sometimes it is. But, not always! All my computer software is up to date, and I'm running iPhoto '11.
MacBook
Pro, OS X Mountain Lion (10.8.2), iPod touch, iPad, iPhone, OS6