I recently came across an interesting new website: wakoopa.

Similar to iusethis.com, it tracks usage of applications. But it has an advantage: you can download a tracker application that will watch what applications you use, and report them to the server. Thus it automatically keeps track of the applications you actually use, rather than relying on you hunting them out to manually report them occasionally.

All of my products are listed, of course (plus some internal tools).

The site design is quite attractive, with some social-site features, to organize into "teams", post and read reviews of products, and suggest software that you might like, based on what you currently use: