A couple of cool tidbits on the jQuery front.
Remy Sharp has written a nice, clear, concise entry on demystifying jQuery's this object. He does a really good job explaining the differences in what this means depending on the context of what you're doing. This, no pun intended, is one of the things that can be a little confusing when you're new to jQuery since the this keyword can either be a pointer to the current DOM element or a jQuery object—depending on the context of your code. Remy's write up should help to clear this up for any new jQuery users.
Ralf S. Engelschall has a released jQuery Plug-in for cross-site AJAX. His plug-in allows you to communicate to a 3rd party domain in a similar manor to the $.getScript() call. The new function he introduced is called $.getScriptXS(). He's even added support for callbacks, so you'll know when the script has loaded. Very nice!