I've used your pretty, clean and versatile theme as a foundation for my site (put a child theme on top) and only added two little things in templates:
- I missed the navigation between posts on single.php (and single-portfolio.php),
- I added conditional tags around the html tag in header for easy targeting of the different IE versions.
(like here: http://paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-neither/)
I'm very happy with your theme, thank you!