Watch my general overview of the MPD24 from Akai. It's not a new instrument, but I've been using it for years, and I swear by it, so I thought I'd throw a short movie up about it.
Novation has managed to make the transition from synths to controllers in style by creating Automap.
One of the coolest controllers to come out in the past few years is the APC 40, a device made by Akai and Ableton.
The Roland V-Synth GT is a sound designer's dream, with an easy to use interface and a powerful synth engine under the hood.
Korg’s Kaoss Pad series is one of the most unique effects lines on the market because of it’s touch screen interface and cool sounds. The KP3 upped the ante by adding contemporary glitch effects and more advanced sampling capabilities. Read the review at MusicPlayers.com.
Access has been making awesome keyboards for years. This is the Virus TI, one of their new generation models. It combines the classic Virus sound and hardware with softsynth ease of use.