YouTube via lesingemonotone — April 27, 2010 — "Testing a out a newly restored Tubon, a swedish built bass-synthesizer manufactured in the late 60ies by Joh Mustad AB in Gothenburg. The international patent was filed 1967 making it one of the first keytars in the world."
YouTube via abertronic — April 27, 2010 — "This a demonstration of the Roland ep-09 Electric piano." Abertronix on Ebay - note you can always find the link in the MORE STUFF section to the right.
YouTube via RjDjme — April 27, 2010 — "Here are some clips of what went on when the RjDj team visited Music Hack Day in Amsterdam on 24-25 April 2010. All the scenes and hacks that were created over the weekend will be released in the store soon. Many thanks go to @dmos: @bomvol @edial @theineke @roelven @mediamatic @haynes_dave for organising it all."
KORG MicroKORG, M-Audio MIDI controller and I'm guessing a KORG nanoKONTROL.
Update via noisesource in the comments: "although it looks like the korg nano pad, its actually the it's the AKAI LPD8. the knobs & lack of an XY pad give it away
(they do however look very similar from that angle)"