azuanagames.com — Totally free online flash games for all ages.Enjoy new games daily, Compete in challenges, Keep track of your friends, and more.

playerio.com — Player.IO is web services for Flash games.Player.IO makes it easy to build scalable games, with services for Multiplayer Games, Storing Game Data and more...

golugames.com — Play Free Games Online

next-gen.biz — Site about games and reviews.

gamesites.co — Fun online games for those who can't get enought of online gaming.

wireless.ign.com — Apple iPhone - iPod Touch & iPhone Games, Cheats, Walkthroughs, News, Reviews, Previews, Game Trailers & Videos at IGN

gamesdive.com — A selection of free online games including strategy, adventure, shooting, sports and puzzle games. Only the best free flash games.

armorgames.com — Another site with lot of great games and a way for your to embed your games in your portals.

freelanceflashgames.com — I found this site and it looks really useful for anyone getting into Flash Game development.

newgrounds.com — Newgrounds is a website for people who love to make Flash games and movies and those who love them. The focal point of NG is the Flash Portal, where users submit their homemade games and movies so that other users may view and critique them. We also offer resources for artistic collaborations such as an Audio Portal where musicians can submit their music to be used freely in games and movies.