I work in Dreamweaver and Eclipse when developing. I think Dreamweaver has a really nice search where you can search for text within all files of your current project.
This is handy when you want to remove a function that is called in a lot of files. You can just search within the current local project. You can choose whether to search within text or in the source code.
Does Eclipse have such a feature to find all files that have the word 'querystring' in them?