Bayesian analysis vs. statistical significance, clearly explained.
Léonie gives a great, clear description of how screen readers switch modes as they traverse the DOM snapshot.
Steve Faulkner gives a rundown of the current state of play between screen readers and Ajax.
You've seen isitchristmas.com, istwitterdown.com and dowebsitesneedtolookexactlythesameineverybrowser.com. Now Gareth Rushgrove has built isitbirthday.com. Subscribe to the RSS feed just in case you were wondering when my birthday is.