Developers interested in using LinkedIn in their apps need only fill out a form at the site.

The LinkedIn platform leverages the open OAuth standard, so integrations should be that much more simple. On a related note, Twitter client TweetDeck is already utilzing the LinkedIn platform. They just announced that you can view or take action on your LinkedIn network updates from within the TweetDeck application. It should be interesting to see the kinds of apps that start taking advantage of LinkedIns APIs. This could turn out to be a very significant event for increasing business networking, and even matching prospective job candidates with jobs.