Windows Live Wave 2 is to be launched today, as of now just ~13 hrs. to go. You can check the countdown clock.
This will include Messenger, Mail, Writer, Photo Gallery and Family Safety, Skydrive, Toolbar etc. - everything on the main beta page
So if you haven't tried these wonderful services yet, you should try them. For any issues related to installation problems, please check the KB article recently updated: The most common Windows Live services installation problems
Also have a look at Windows Live Beta release notes.
I hope with this new release, installer works well for all.