FlickrNet is a .NET library for implementing all of the Flickr API's methods. It is designed to reduce the complexity of calling the API, especially with regards to authentication. This library can be accessed from a variety of frameworks and is written entirely in C#.
Each week we see dozens of mashups added to our mashup directory and often these use and combine APIs that go beyond the typical Google Maps mashup of old. This past week three of the more innovative ones go beyond just maps by using APIs from Netflix, MyBlogLog and Flickr. Here's a quick overview:
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.