One of the ironies of Web 2.0 applications is that the number of them increases on a daily basis. Designed to track Web 2.0 applications and services, Listio is a directory and product review site. Visitors can browse and rate a selection of Web 2.0 applications. Each application is profiled with a link to its home page. Like the web itself, the services are varied with tools such as Petfinder, FeedMyTorrents for automatic downloading, and Seemile, an online education site.