These are some things on the web I've helped make that I'm proud of.

Acumed.net's Faceted Search
When using the search, the results are grouped into their respective content types.

CountyOfGlenn.net's Sitemap
For users adept at using Ctrl+F to find things on a page, this one should come in handy.

AnythingInABasket.com's "Build Your Own Basket"
This one was a lot of fun to build. And the current maintainer has done a great job improving the UI.

DesignByHumans.com's "Buy Now" Button
I always like it when I can save someone a click.