Note from Jimmy Hua:
A friend of mine, Alissa, posted this on her site. “Where is the fold” is a very interesting site for those who are interested in what users can see on a site when they reach your site. With different screen resolution, certain information on your site can show up above or below the fold. When it is below the fold, it makes it difficult for users to find that information. This tool is great and if you are a web designer, you should have this sitting in your bookmarks.
This post is shared through my Google Reader from another source. All credit of the post belongs to them which you can access by going to Where Is The Fold
Type in a URL and an overlay shows where “the fold” is for users on various screen resolutions.