Interesting that claim 1 appears to have been cancelled for some reason, perhaps due to being insufficiently clear. That's generally the broadest claim so clearly the USPTO saw fit to narrow the patent down to an extent, just not as greatly as would seem appropriate, at least from the other comments on this thread.

It's also a continuation and claims priority from two existing applications, although unfortunately, documents are not available for those applications, at least from the system I use which is generally fairly comprehensive[1]

[1]http://worldwide.espacenet.com/publicationDetails/originalDo...