Here are a couple useful links I've found:
100 Free High-Quality XHTML/CSS Templates - Bunches of templates ready to use, most if not all are licensed either under MIT or GPL.
Company Dark Blue Template - Nice little conservative business company template.
Free CSS Layouts and Templates - These are nice if you are just looking for the scaffolding of the site without any artwork.
Jquery - Must have for most of my current web work, also see this post at Encosia for tips on having Google Host your jQuery (all the cool kids are doing it...)
jTemplates Plugin - Great for client side templating of JSON data.
Encosia's Posts on jQuery and .Net nuances - Great place to start if you are new to jQuery and how best to use it with .Net
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