I began working with web testing years ago with the MS Test framework when I got a version of Visual Studio that allowed it's use. I started small and began building simple ping tests. Over time it developed into a tool would run sets of tests daily and fed the results into a blog that I could read every morning. It tought me a lot but eventually I hit too many limitations. License cost being the most obvious but also I couldn't create a custom interface for it. I had to work within Visual Studio and the UI was too blunt. This forced me to finally bite the bullet and start converting my system to NUnit and Watin.
So if you've ever setup caching on a Sitecore site you'd be familiar with the admin cache page. I recently had to set it up on a fairly large existing site and though there were a lot of other issues, one was that I was overwhelmed by the length of the list I had to view to get the information I needed. So I spent a little time and built a new admin cache page so that I could search just for what I wanted and clear out the excess noise. I built it to be a drop in place setup so that there are no external libraries or files. You can literally just copy these files into the same folder the original is in and you should be able to start working with it. You can get the files on the Cache Manager UI or checkout the source on Github.