How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
Apple iMac 27" 3.06GHZ (2009) review | TechRadar
iMac (Early 2009) | Low End Mac
iMac 2009, iMac 2010 and iMac 2011 - Apple Broadcom BCM94360CD - 802.11 a/b/g/n/ac with Bluetooth 4.0 Upgrade Kit | www.osxwifi.com | Native Support for Apple Broadcom BCM94360CD and BCM943602CDP for PC
Upgrade the Hard Drive in 2009 and Later iMacs
iMac Intel 20" EMC 2266 Teardown - iFixit
How to disassemble 27" Apple iMac for repair or upgrade. - YouTube
Teardown of Apple's Thunderbolt Display finds same LG panel used in 2009 iMac | AppleInsider