Great job! It's pretty clean.
Some suggestions of things to work on....
- You could make your blog the same theme as your website. (I like Wordpress myself.)
- The 'Categories' for the links on the side could be re-named
- Some of the links need to be fixed (specifically in the footer)
- I would add the page links on the link page into a drop down menu when you hover over the main topic
- Remove the ipnoid.com image at the bottom.
- Your 'Resources' page could be kind of cleaned up
- Put spacing b/w sponsors logos on your sponsors page by using <br> as line breaks. Check with Boeing and some of the other companies about their brand identity, as I know that one of our sponsors is critical of how their logo is used and it's important to follow their rules on usage of their logos.
- Remove 'Dean's Homework', 'Light Bulbs', and 'Demonstrations' links until you have completed their pages.
- Make pages for all of your robots! Those robots that you left out are sad

Also make sure that all of the links on your page work, as I clicked a broken one.
- I also just noticed that the RSS link didn't work either.
- Where does your contact form go? I suggest you register for a google apps account (or similar) and post your emails up there as well.
BTW, what are you using as a backend? It kind of looks like you are using a Wordpress theme without the Wordpress backend.
I hope this gives you some ideas for improvements, but I would have to say other then these VERY minor issues, I really like your design because it's so simple and clean. Feel free to email me & look at our website if you have any questions -
david@teamneutrino.org