As it turned out the BlueSmirf Bluetooth module by default listened at 57600 baud, while the microcontroller was sending out bits at 115200 baud. Sending commands using Putty to change the baudrate solved the problem (but not after also discovering a defective flatcable connecting the two board. Always make your own!)
http://www.sparkfun.com/datasheets/Wireless/Bluetooth/rn-bluetooth-um.pdf
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