King.com is good for old people who wanna play games. The games are ok...the usual stuff you see, but they offer rewards like online chat and create an avatar for collecting stars from the games...pretty lame I know.
Mini-Clip.com is a great site that offers many genres of games in a wide variety. All of their games are pretty good and they don;t have many crappy flash games like some sites...their games are pretty high quality and it is easy to maneuver on the site.
Armorgames.com is a good site too, you just have to weed out all the lame games and find the ones worth playing.