My first app has been published to the Zune Marketplace. The app is called BizTweet and may be found in the Social category. The purpose of the application is to aggregate information related to BizTalk and AppFabric.
The app is very simply to use. You simply select a search term from the list on the left hand list and then click the Lookup button. You can then scroll through the results on the right hand side. If a tweet contains a link, you can click on that tweet and you will be redirected to another page in which the URL will be displayed.
This is my first WP7 so keep your expectations low :-). If there is interest to evolve this application then I will continue to enhance the application. Please leave feedback below or send me an email.
Overall, I will say that the SDK and tools that Microsoft provides are top notch and I think the WP7 platform is extremely promising.