Good quotes, and most recognizable quotes aren't necessarily the same thing. Many listed here are very good quotes, and most are very recognizeable, but when people today can still quote a line from Gone with the Wind and Casablanca, they have to be the top of the list. Taxi Driver and Dirty Harry have stood a pretty good test of time too.
As for more great quotes (not necessarily most recognizeable), Eastwood is full of them. I don't think anyone has mentioned "Dying ain't much of a living boy" from The Outlaw Josie Wales.
If Arch Stanton comes around he could probably help with some Eastwood quotes.
WHO HERE KNOWS WHERE THE NAME "ARCH STANTON" COMES FROM?