http://www.mtholyoke.edu/acad/polit/damy/B...ng/howprwor.htm
There's some information on various proportional representation systems and some of their strengths.
Sounds like Germany, Bolivia, Venezuela, Wales, New Zealand, Hungary and Scotland use a method (according to this link anyway) called mixed member proportional voting where you vote for both a candidate and a party separately.
Some interesting reading for sure.