Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
apple-history.com / iMac (Mid 2010)
Review: Apple's new 24-inch iMac (aluminum) | AppleInsider
OWC - 2 GB memory upgrade kit - 2 x 1 GB PC5300 DDR2 667 MHz SO-DIMMs for all Apple MacBook / MacBook Pro, iMac Intel, and Mac Mini Intel models: Amazon.de: Computer & Accessories