If you don't know what you're doing, leave it alone.
As our FE pointed out elsewhere, it is still in beta form. It is not meant to be used in a "production environment". In other words, there are still bugs and small changes may still be made.
For example, my installation is on a completely separate drive, on a multi-boot machine, so it can't possible screw anything else up.
As far as I can see, it's been released for two reasons. One: to enable Microsoft to gain as much information from the "real world" prior to finalising its release and Two: to enable IT Professionals to start to test it in their specific environments, to see what changes they need to make in order to accept it onto their networks. This can have a lead time of perhaps a couple of years in some cases and many wont consider it until the first service pack is released.
Quite honestly, it's pretty and there are some new bells and whistles that in the light of day, may or may not get used. But at the end of the day, It's an operating system, just like XP, or WIN2K or anything else you wish to name.
I rather suspect however, that for many people, much of the capability will not be used. Much the same as for example Microsoft Office, where research has shown, most people only use (on a regular basis) about 5 - 10% of its capability.
So I wouldn't get over concerned about being left out!