These are products that have been around in Beta and Release Candidate forms for a while. The announcement that they’re now final, should actually read that they were ready a little while ago – the final version is the same as the recent release candidate!
The suite includes the latest version of Windows Live Messenger, Windows Live Photo Gallery (which is a great improvement over the Photo Gallery built in to Vista, includes Flickr support and works on XP), Windows Live Mail (also better than the version that ships in Vista) and the fantastic Windows Live Writer, which is the best blogging software available (sadly this blog’s host doesn’t support it, which is partly why I don’t post as much as I might!).
You can get the suite from download.live.com.