+1 on the fixed width. I'm a developer, so I have a big monitor -- it's hard for my eye to follow sections of the document without lined up elements.
- We're now using Maven Pro for headings (no more Trebuchet).
- Replaced Lucida Grande with Helvetica in the nav bar (sorry Windows users, you get Arial).
- The site now has a max width of 1200px instead of expanding infinitely. This seems like a reasonable compromise, since any purely fixed-width design draws the ire of people who hate fixed-width designs.
Keep the feedback coming!