Linked in is buying slideshare. I've always loved slideshare for the ability to quickly share presentations and also to find other great presos as well. You can record your audio and go backand link it with your slides to create a slidecast. Lots of features there. Now, Linkedin has bought slideshare. FYI. We'll wait and see if it is absorbed or still stands alone. If it is absorbed, that won't be good for my students because linkedin just doesn't fit for this time in their lives in my opinion.