This thread will work very similar to the DIY\FAQ threads in some of the other forums. When you find a cool flash game simply start a thread about it that contains the following information within the thread and contains "Flash: " at the beginning of the title.
Name of the game
A short description of the game
Most importantly, a link where to find it
Then IM a moderator a link to the thread and let them know you would like it added to the "Cool Flash Games" thread. An easy way to do this is using the alert moderator function that is built into the forums... How To Report A Post To A Moderator