Go ahead and log into the Web Client.
Pull up your virtual machine list.
Down in the bottom right corner of the center pane (with all your vm's listed) is an icon of a piece of paper with an arrow on it. That will allow you to push out a CSV.
See screen shot.
Hope this helps!
This is a bit of an old post but, just in case anyone else finds it on Google (as I did) and is after an inventory tool for VMware, I thought I'd point out that our company has created a tool which automatically inventories your VMware environment.
I hope it's ok to share a link to it here: XIA Configuration Server