First came TinyURL, now TinySong. Just as TinyURL allows you to shorten long URLs for sharing in Twitter and elsewhere, TinySong does the same for sharing songs for immediate streaming.
Other tiny sites:
TinyChat is a service for creating disposable chatrooms. Each chatroom gets a unique TinyURL for easy sharing, and nobody involved needs special software to join in.
Tiny Geo-coder is a basic online app for determining the latitude and longitude of a location, with a simple API and practical uses for web development.
Scrumy is a simple web application for Scrum project management. Scrumy is, at the basic level, a virtual taskboard.