A good tip to keep in mind when writing efficient jQuery selectors.
JavaScript
Quick Tip: Think Right-to-Left with jQuery
Cutting The Interrogation Short
Alex Russell on feature detection in JavaScript, with a great aside on the near-religious fervor that some have for the subject.
iPad View Source Bookmarklet
iPad View Source Bookmarklet
Meebo Bar embed code open sourced
Beyond the announcement of the bar going open source, this post provides a view into the product iteration cycles over a couple of years.