Alesis has introduced a cool new drum pad controller/drum machine, the Performance Pad. It’s a drum machine, an electronic percussion instrument and you can use it as a MIDI input device.
Performance Pad features eight velocity-sensitive drum pads and a built-in electronic drum machine with professional sounds and features.
Features:

8 natural feeling, velocity-sensitive drum pads with Dynamic [...]

This 16 pad USB MIDI controller is an inexpensive way to add a ton of flexibility to your system.
The MPD16 is an MPC-style MIDI pad controller. It gives you 16 touch-sensitive pads that you can add to your computer music workstation by just hooking up a USB cable. Carrying on the style of the MPC [...]