Decided to use my "chromosome" mark as the favicon.
Oops, onclick styles shouldn't be in the header section.
Trying for a (somewhat) more minimal, legible header.
I really like the big banner image, but the site header should probably more just get out of the way. Also, auto hyphenation shouldn't happen in headers and titles.
Various minor edits to appease the W3C validator.

Apparently <li> isn't supposed to be a direct child of <nav>? I feel
like this adds unnecessarily verbose markup, but whatever.

The Validator doesn't like a couple `rel` tags I got from
Microformats.org ("publisher" and "feed"), nor the XHTML attributes
taken from the Creative Commons license statement template, but I think
I will leave those in.

Also, I realized the img[alt] styles I had would shrink comic images,
not just set a max-width for the block of alt text. Guess I only need
to set the font and white-space styles for alt text which contains the
original script for my comics...
Making the Stylus code more "stylusy".

That mainly means generally removing commas for multi-selectors, and
especially writing selectors of specific nested elements with
indentation instead of a space -- much more readable that way, I think.
Validating <nav> borked positions when reflowing after onclick effect.