LinkedIn Applications enable you to enrich your profile, share and collaborate with your network, and get the key insights that help you be more effective. Applications are added to your homepage and profile enabling you to control who gets access to what information.
Connect your virtual lives with the WordPress LinkedIn Application. With the WordPress App, you can sync your WordPress blog posts with your LinkedIn profile, keeping everyone you know in the know.
Google presentation application
Google presentations are a professional way to introduce yourself and your work.
Mashable talked about it http://mashable.com/2008/11/02/reexamining-linkedin/