Proportional Representation - Questions and Answers (Microsoft Word format)
How does choice voting compare to other methods?
What is Instant Runoff Voting? - Why is it so great?
Sacramento's Fun-House Mirror:
Showing How California's Legislature Doesn't Closely Represent its Body Politic
Single-Member Districts: Divide and Conquer
Redistricting in Tic-Tac-Toe Town
The Center for Voting and Democracy's Redistricting Roulette
Vermont groups have produced a demonstration and a more recent report (pdf).
Here is a series of articles by Steve Chessin:
Glossary of terms related to election methods
Quotes from authoritative sources about PR
These other sites provide a lot of info on PR.
Instructions for counting a choice voting election (Microsoft Word format) (PDF format) and a related form (Microsoft Word format) (PDF format)
PR could boost voter turnout.
Here are some stats on the racial and ethnic composition of the state assembly.