I recently used KMZview.com and found it to be an incredibly useful tool for viewing KMZ files directly in the browser without the need to integrate them into AutoCAD. The website layout is simple, easy to use, and very similar to the Maps pages I've used before, which can allow anyone with no prior knowledge to explore KMZ files without the need for any specialized software.
It's great and useful for quick previews or when you're working on a computer without software that can load these types of files. Review collected by and hosted on G2.com.
For relatively larger KMZ files, this web page may take a little longer to load. Review collected by and hosted on G2.com.