On heels of its announcements this morning, Apple began showcasing most of its new iMac lineup at its California store locations, including its flagship San Francisco store -- which received both the low-end 20-inch iMac and the 2.4GHz 24-inch iMac offering, but there was no sign of the (overclocked) 24-inch iMac running at 2.8GHz. The store also c
