I'd still like to ask that a measure of simple voter registration be included in your graphs. Other than that, they're excellent visual summaries of where things stand, and I think can become a very useful tool for party leaders and interested citizens in tracking trends in relative strengths and benches for higher offices.
Well, the one above does take that into account, along with other variables. In fact, in the Pacific and the Midwest, census/voter registration is counted twice since there are universal legislatures there. If you're wanting a map that solely shows party affiliation, then this would be what you're looking for:
This one uses the most updated Census post for every region except the Mideast, which includes the new MCPR flips.