The flickrj-android library is designed to wrap the Flickr API and provide improved support for Android and the Google App Engine. This library also supports Java 5 syntax and the new Flickr OAuth authentication model.
Of all the hundreds of tags you can see in our mashup tag cloud, the second most popular behind "mapping" is "photo". How popular? As of now there are over 200 photo-related mashups listed at ProgammableWeb -- 202 by today's count.
Now that the Instagram API is available with last month's public beta launch, we've started to see some fun apps built on top of it. Since Instagram's only official product is an iPhone application, that means we're seeing web clients, badge widgets and even Hot-or-Not style games. The best part is that some even cross over to multiple mobile photo APIs, increasing their reach and usefulness.