Just a heads up: I wrote a three-part series of articles for Source, which is the Knight-Mozilla OpenNews site devoted to covering the intersection of journalism and programming. Here are the links:
The series is about "sane data updates," which is a rather esoteric topic, but one that every journalist/programmer has to grapple with at some point or another.
It's all stuff I learned the hard way over the years, especially from chicagocrime.org and EveryBlock. I really enjoyed taking the time to write it down and formalize it into concrete advice.
Hope it's helpful to folks out there!