Lg devices

gt540 optimus
(fastboot mode Volume up + Camera and power on)(recovery home+power on)

optimus one p500
(hold home & vol down button & power button until boot to recovery)

optimus 2x
(Hold Volume Down & the Power button until the device boots to the recovery)

optimus 3d
(Power and Volume down button)

tmobile g2x
(Vol down + power button gets u to boot recovery)

(Hold vol down and power on)

optimus black
(Power button + VolDown)

lg thrill 4g
(Power + Volume Down Key)

nitro hd
(power+ Volume Down Key)