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The Stelladaptor 2600 to USB Interface lets you plug in old Atari 2600 joysticks and paddles into your PC for use in your favorite emulator. While any program that can read incoming 8-direction digital joystick signals should work with the device, special software must be installed to use the analog Atari 2600 paddle and driving controllers. The Stelladaptor is set to ship March 21st for $30.

In theory, any nine-pin controller — like those from the Sega Genesis (and possibly even the Sega Saturn, if memory serves [Update: It didn't serve well enough. The Saturn used a different connector - Thanks, Jacob]) — should work with this interface, as well.
Read [via GadgetMadness]