Script Summary: Search your Google Reader feeds using Google's Custom Search inside Google Reader
*** This script is now useless, Google Reader has included its own search ***
Works just like the userscript from Google Operating System only the results are displayed inside Google Reader like normal posts. This script includes one button to search the current feed with blogsearch and another button to search all of your feeds using a custom google search engine. See the above link and the original post for how to setup your custom search engine and get it working with this script.