Miniclip is my favorite game site,they offer lots of childrens games,but if you look around,you'll find plenty of "grown up" games too. You can also see your world ranking,for the day,week,and month,after playing each game!
Love this site, First you make a "Yo Me " that is your avatar .Then you get to custumize it by picking their clothes, picking friends, play games, getting rewards, make friends, and have a blast it's pretty much a childs "facebook".(but with out the adult content facebook holds).
miniclip.com - According to http://www.malwareblacklist.com this site contains a trojan that can harm your computer.
It was detected and reported in May 2011. Take care when visiting this place.
You can find more details at http://www.malwareblacklist.com/searchClearingHouse.php