Very professional site !
A few suggestions:
1. Watch out for your load times, your students page takes a few seconds to load on a slow computer. Its a neat page !
2. Embed your picasa album. You can write a php script that pulls picasa album photos or just use the google slideshow feature.
The DiscoBots do a picasa php script here,
http://2012.discobots.org/node/14
3. News - put an RSS link for your website news section, that is a great way to get traffic to your site. People will use Google Reader to look at recent changes to your site.