Change emacs font size

Hi:

Sometimes i think emacs font (under X11) is very big. I got tired of it, googled a bit and found out that

meta-x customize-face RETURN default

Takes you to a nice menu where you can set size. Just change that 120 for whatever you like (100 for me). Then set for current session and save for all future sessions. This creates an entry in .emacs file.