For those of you that are just getting into JavaScript, this is a must-have tool for checking your code. It will tell you what you are doing wrong (using multiple var statements, spaces in wrong places, etc) in your code and will help you write better JS.
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Two CSS properties that will now be available in iOS5 in September: overflow: scroll and position: fixed:
This a very good deck of what you can do to make your jQuery faster. Every little bit helps, right?
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HTML Email Boilerplate
For those of us that never learned table-based coding, this is a great resource for getting an html boilerplate