Statistical and Scientific Basics
Over at Scienceblogs, a number of contributors have started producing posts that explain basic concepts within their fields.
Mark Chu-Carroll at Good Math, Bad Math has been producing posts on concepts within statistics. So far he has written on the topics: mean, median and mode; normal distributions; standard deviation; margin of error. Others are covering topics in Physics, Biology and Mathematics. An up-to-date list is being held here.