Everyone should have a "Training" tab in oasis. This tab will take you to Lynda.com to get full access of their streaming tutorial library.
The 2011 version of JavasScript Essential Training that they added this year is way better than the 2007 version.
Kim suggested http://jsfiddle.net/ as an awesome js helper.
ternary if operator
The this keyword
The this keyword at quirksmode.org
Sure, we know how to concatenate strings, but what if you want to chop up and rearrange strings?
Likewise, you can mix and max arrays.