Is there an Earth Clock widget for Windows 7's desktop?
I mean something like this, a view of the earth, with the evolution of the light part, according to the time (the clocks in themselves are not really important):
Here is a gadget that provides the map and not the clock:
WorldTimeServer.com has a couple of sidebar gadgets provide world clocks. You can create a separate instance for each timezone you want to track.
I think this could suit your needs: Sun Clock.
This is a conversion of a Yahoo! widget for Windows 7, made recently. It is still a work in progress, and obviously you can post comment on the given page, the author is open to suggestions.