If you want to see in realtime what's going on Digg you can use their digg spy page. This popular Digg feature uses a dynamic Ajax UI to let you see diggs as they happen. And now it serves as a model for a growing number of mashups that use web APIs to give you a realtime window into activity on a variety of services.
Yahoo has just released a cool new embeddable media player, Yahoo WebPlayer, that supports MP3 and WMA files, as well as multiple services like YouTube and Yahoo Video. Yahoo has also launched a whole new site to attract publishers and developers and to encourage them to use the player when publishing audio and video across the Web.