You could buy the $15 Xbox Live Arcade game Virtual On: Oratorio Tangram and play it with a regular controller. Or you could cowboy the fuck up and buy Hori's $323 dual joystick controller designed specifically for Virtual On.
This is the second design of these sticks, redesigned after fans complained that the first ones weren't faithful enough to the Dreamcast original. And if any company needs to listen to the whines of fanboys, it's a high-end Japanese peripheral company that makes $300 controllers designed for $15 games. [Insert Credit via Kotaku]