A-Tech for Apple 6GB Kit (1x2GB 1x4GB) DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook (Late 2007, Early 2008, Early 2009), MacBook Pro (Mid 2007, Early 2008), iMac (Mid 2007) - Memory RAM Upgrade at Amazon.com
How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book, Mac Book Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) SODIMM Memory MAC RAM Upgrade
A-Tech for Apple 4GB Kit (2X 2GB) DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM
iMac (2007-2009) Memory Installation Video - YouTube
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
CMS 6GB (1X4GB) & (1X2GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 2.4 20-Inch Early 2008 - B117 at Amazon.com
Apple iMac 24-inch June 2008 3.06GHz Intel Core 2 Duo (MB398LL/A) | eBay
Maximum RAM iMac early 2008 | MacRumors Forums
Memory Upgrades for Apple iMac 2008 - Up to 6GB
iMac | 2.4 GHz Core 2 Duo | 24 Inch | Aluminium - Techable.com