Flash Player 10.1 for Froyo is available for download from Android Market. Nexus One users who have just installed Android 2.2 Froyo OTA or manually, can download Flash Player 10.1 from Android Market. It’s required to run flash on Froyo and the update doesn’t come with Flash pre-installed. So, you have to download and install it manually, as an app.
So go to Android Marketplace and download Flash Player 10.1 Beta for Froyo to experience Flash based websites and games on your Nexus One.