Well I've played around with temperature values in the MPS430 board.  Managed to blow a mosfet, and burnt my fingers. 

The heated bed MKII arrived after christmas and I've had it heating up.  I found an old Dell PC power supply, and have rigged that to supply the 12V for the bed.

While just checking the forums, I came across these two posts.  They offer more information on heated bed control circuits. 

http://forums.reprap.org/read.php?1,111424

http://hydraraptor.blogspot.com/2007/10/measuring-temperature-easy-way.html

For reference in the circuit design, here are a few notes I've collected since Christmas.

Also since I keep losing this, basic circuit for Launchpad MPS430

http://www.ecircuitcenter.com/circuits/therm_model1/therm_model1.htm

The derived R / T curve with Wolfram Alpha

Linearizing R/T curve