One of my earlier concerns about LinkedIn was that it was very static and was little more than an online rolodex. They just launched a new applications feature that could dramatically changed LinkedIn.
These applications allow you to pull content from other sources into your LinkedIn profile, making it much more dynamic. Just a few minutes ago I added the Blog Link Application. Now it is pulling in blog posts from the three listed on my profile: this blog, Real Estate Space and DougCornelius.com.
One of the reasons I liked Facebook was its ability to aggregate content about you from multiple sources. Now LinkedIn can do the same thing.