Carl Bialik has everything you've ever wanted to know about estimating crowd size (blog post too).
Kathy Frankvoic considers polling lessons from 2008 and challenges for 2009.
David Hill ponders the still gloomy "wrong track" numbers.
Mark Mellman names the four conditions necessary to deliver bold policy change.
Nate Silver questions a contradictory Alaska poll.
Kevin Drum revisits his election projection poll (via Sides).
John Sides reviews new research exploring links between early life experiences and voter turnout.
Henry Farrell see the fingerprints of political science in the 2008 campaigns.
PPP will be polling Missouri this weekend.
Patrick Egan and Kenneth Sherrill (pdf) author a new report on California's Prop 8 (sponsored by the National Gay and Lesbian Task Force; via Coates via Sullivan).
R (the software that powers our charts) gets a New York Times profile (via Gelman with equal time for SAS).
shows reproduces an example of webcomic xkcd, by artist Randall Munroe, on how graphs lead to a decline in love: