Use your favorite search engine, for example Google.com and type in the search box "download free flash games", that's how I find things.
A couple places that you can play/download flash games:
Just make a new downloads folder in my "my documents/ea games/thesims 2" :) Just make a new downloads folder in my "my documents/ea games/thesims 2" :)
The DSi downloads games from its own DSiShop, and the 3DS downloads games from its own eShop.
The Playstation Go has to use downloads while the PSP can use UMDs or downloads
Games for Windows Vista can be downloaded from Game Top, Best Vista Downloads, My Real Games, and Free Microsoft Downloads. Many of these games are free.
There are many free downloads other than games. Development software programs, public videos on YouTube and software updates are examples of some free downloads.
At girlgogames.com there r free hair games with no download
There is wiiware, which is new games that are only sold online as downloads, like xbl arcade. These games are usually around 10 USD minimum, and I haven't tried one yet, but some of them seem worth downloading.
I think ThePirateBay.net
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They go to your Games menu. All downloads can also be seen in your Downloads History. Go to Account Management > Download History.
One can find free downloads of PSP games from pspshare and pspube. One can find and watch hundreds of free PSP games from Youtube and download from there.