I like it alot! However I'll try and be as detailed as I can on the pro's and cons (for me) as an example end user.
Pro's:
* Quick loading
* Navigation is well thought out, You have a lot of data to display to users but don't want to flood them with a long list of options, this collapsible menu fits perfectly and grouped into sections is easy to find what you want.
* Color scheme is good, yellow and blue would have been antiquainted so good move!
* Banner adds along with the nav some dynamics to the site.
* Increase/decrease font size.
Con's:
* Too much white space. After the banner at the top there's little left to draw the eye. I appreciate this is a functional site but the better and more "web 2.0" it looks to the eye the more it will be perceived as a modern company, which is good cheap advertising.
* Logo could stand out a bit more. It looks a tad alienated up there on its own try a drop shadow or something of the like to make it stand out a bit more.
Suggestions
* Add some icons, perhaps in the navigation before each subject word. Definitely for the font size + - I would represent this with some spy glass type icon.
* You should designate some area in the layout for advertising company promotions. Rather than get a promo later and have to try and fit it on the page somewhere.
* Bump the page top margin by 5 or so pixels so you can see the top of the image.
* Experiment with different background colors.
Just my 2 cents worth feel free to ignore it
