I like the simplicity, and surprising utitliy of LinkedIn applications. I was surprised to see a blog post from one of my connections, and within a few clicks configured LinkedIn to show my own blog posts. I suppose this is really useful for people who market themselves a lot – but also for people who have no other touchpoints with a lot of all of their colleagues and former colleagues.
Finally – I just think it is cool, and is another round of evolution in web mashups and in letting people share their informatin how they want it, where they want it.