Don't know about GoogleAnalytics, but if you would use Statcounter, you have a one page overview.

You could use both of course.

The only way I know of to do something as this would be to use one ua code for all of your sites. You can still keep the current one you have but you would need to add a second analytic code to your sites in order to have them all trac on to one.

Where this is going to raise a bit of a problem though is that your home page visits are all just going to be the / listing for all the sites included. However if you are using this just for keywords tracking then just add a new profile for an exsisting site and add that code to all your sites you want to track.

Here is how I would do it I would set up a new profile at hubpages and publish atleast one article their so that you can get a new ua code for all your sites. Then just add that to all of your sites and you have them all in one place. Other then that though I do not think there is any other way to do it but I may be wrong.