Install Flash on a jailbroken iPad, if you really want to
Nevertheless, if you're in the iPad jailbreaking set, go ahead and give it a try; Engadget has the how-to. You're missing out on all those crazy dancing skeletons and laughing babies. As you can see in the video you'll want to break out that Bluetooth keyboard to enjoy the full spectrum of the Flash web, as touch events aren't always analogous to mouse clicks and controls for games often require basic arrow key functionality.