strongly recommend

JSConf.eu 2011

The European JavaScript conference is really close. It's scheduled for 01 and 02 of October. I wish I could be there. I hope that the videos from the lectures will be shared online, as this happened for the last year. I strongly recommend to watch them. There are available here http://blip.tv/jsconfeu.

API Design by Matt Gemmell

Did you ever wonder how to write your class. That's a very helpful article. I strongly recommend it. Check it here.

Chrome Devevelopment Tools could be really helpful

"Your browser is one of the most and best instrumented development platforms -- you may just not realize it yet. In this episode we'll take a whirlwind tour of how to analyze network performance, rendering and layout pipeline, as well as detecting memory leaks in your Javascript code, and using audits and extensions to build faster and better apps!". A nice screencast by Ilya Grigorik. I strongly recommend the subscription to GoogleDevelopers channel.