I currently work at Xmarks.com, which develops web browser extensions to help you sync your bookmarks, as well as discover new web content. My role has been to work primarily on the Firefox extension and Google search result page integration, but I've also helped develop Google Chrome extensions, help debug issues in the IE extension, and some simple backend work using Python and Django to develop high traffic REST apis that talk with our extensions and SERP pages.
As a side project, I've developed Boomtango.com, a web history browser extension to help manage your web history. Boomtango automatically categorizes all the web content you consume and provides easy to use tools to re-find web pages that you've previously visited.
AutoRefresh is a python http server for making web development easier. As you make changes to your project, autorefresh automatically refreshes your web browser, avoiding having to constantly switch between editor to web browser while working on a web app.