So here I found something really cool on www.engadget.com. Some prefabricated tiny circuits with different purposes like joystick, triggers and so on. They snap together through magnets, that´s also where the current goes through. This all seems pretty neat for some simple DIY-synth construction. I have put myself on their mailinglist to get updates an so on. More info in this video:

littleBits intro from ayah bdeir on Vimeo.