The hottest thing in redistricting - if there is such a thing - is undoubtedly the emergence of "Efficiency Gap" analysis, and whether this measurement of how gerrymandered a map is, will receive the imprimatur of the U.S. Supreme Court.  While we wait, The Campaign Legal Center has released this report looking back through the decades to measure the efficiency gap in state legislative and congressional maps.  Their point is that partisan gerrymandering has never been more rampant and excessive than right now, but the charts show other interesting patterns as well.  Read the Report here.