Add a copyright footer (CC-BY-SA 3.0)

The footer is positioned at the bottom of the viewport, or is
pushed down by page content. This is a nifty effect, and is
achieved without javascript. Thanks to reisio in #css on
irc.freenode.net for assistance with this technique.
Larger avatars in comments
Forbid content overlapping with the footer
Make the comments form validate under XHTML 1.0 Strict
Close comment properly
Validate under XHTML 1.0 Strict
Omit the country code on license URL

Also, move static content into footer.php directly.
Add some actual styling for blockquotes
Remove random file, dunno why it was ever here
Consolidate JavaScript files
Remove site verification tokens
Rename script.js
Improve ordering of styles & scripts

wp_head will probably output CSS first, and JS second, so call
it after our own CSS but before our JS to get the right overall
ordering.
Trim trailing whitespace & fix HTML whitespace
Upgrade JQuery + UI
Add fancier blockquote styling
Improve blockquote formatting
Add broken link styling to external CSS
Add styling to the post author's comments
Remove some inline styling