Tee-Tip is an easy-to-use and customizable tool-tip system. Simply place the cursor over a Tee-Tip enabled word, sentence, or paragraph, and a tooltip appears containing the associated content. Tee-Tip provides a convenient way to present enhanced contextual data on your site and supports a variety of border styles, custom cursors, and special effects.
Mychoonz is an MP3 player implemented in AJAX. It allows you to listen and organize your music within your browser, anywhere, anytime, as long as you've got an Internet connection. The idea is similar to projects such as Ampache or Mp3Act, but it focuses more on user interface rather than features.