Printer2 PM'ed me this link for a games website and asked that it be shared with the GOTD community. :)
SoupToys' TOY BOX (17 Mb):
Description [from a review by Lifehacker.com]:
SoupToys is website offering virtual, physics-based toys, that run directly on your PC Desktop.
Downloading the TOY BOX freeware, gives access to dozens of interactive play items. Free registration with the site allows users to upload and share their customized "playsets".
The TOY BOX application is a 17 Mb download and runs well on Windows XP.
Homepage:
http://www.souptoys.com/
Download Page:
http://www.souptoys.com/get_toybox.php
Pre-Configured Playsets:
http://www.souptoys.com/randomroom.php?lines=5
Tech Support Page + Requirements:
http://www.souptoys.com/help.php
Screenshot (captured on my PC):
http://i41.tinypic.com/ifxw0j.jpg