We've updated SkyDrive with some nice new features. One of the biggest hassles with SkyDrive before that was that it was hard to invite new people or add new contacts to the list. We now allow you to add new contacts (whether or not they have Live IDs) and people will be sent invites. If they don't have a Live ID, they'll have the opportunity to set one up. This should make sharing much nicer.
Another thing we added is RSS feeds. For example, the feed to my public folder where I put blog related stuff is:
For more details on the new features, see the SkyDrive blog.