This is an official Ableton video introducing the Akai APC40:
The Akai APC40 (Ableton Performance Controller) is a dedicated controller for Ableton Live, designed by the same engineering team responsible for Akai’s iconic MPC range of products. This is a dream come true for the Ableton Live community and an exciting first step into the world of Ableton Live for new users.
The APC40 is a very nice piece of gear. If you’re an Ableton Live user, you’ll definitely want to check it out.
Here’s another overview video, filmed at the 2009 NAMM Show: