I love the SO-family sites, and want to suggest a SE site for application research. By that, I mean a site on which individuals, companies and other groups could post information about computer applications, including both desktop and web apps, for a variety of uses.
There's a lot of information on the Internet, but it's disorganized. Users of this site could identify the problem they need solved and list the applications they've found that are designed for their problem. For each application, they could list prices, features, pros and cons. This would help people like us (i.e. developers) and other people, who are either looking to create a better product or are looking for the same kind of product. Ideally, this site will become a key reference for others as a comprehensive catalog of product reviews.