i would have to say. miniclip .com.
Before I played Console's I used Miniclip a LOT.
I also usually play on miniclip. It just has so many!
I dont really play flash games anymore. But probably miniclip.
Miniclip and kongregate were some really good sites back in the day. I used to play like crazy when I was little.
Bored.com, it's not blocked at my school and has some decent entertaining games.
I like Kongregate. Just Google it and you'll find the site. I recommend it to people who like browser games. I guess these would be considered flash games...
Anyone remember the site Zthing? That used to be awesome before it shut down
I usually play on Kongregate or OneMoreLevel
I play here:
www.kajgana.com It's the biggest forum in my country, there are a lot of free flash games ;)