I found this to be interesting in the link you provided-
"Microsoft is announcing the availability of an automated Microsoft Fix it solution that disables Windows Sidebar and Gadgets on supported editions of Windows Vista and Windows 7. Disabling Windows Sidebar and Gadgets can help protect customers from potential attacks that leverage Gadgets to execute arbitrary code. "
In addition, it says-
"Customers who are concerned about vulnerable or malicious Gadgets should apply the automated Microsoft Fix it solution as soon as possible."
How did customers know about it? Of course, Fix It is no longer available although I do have a copy of it somewhere.
Yesterday, I was researching Blaidd's problem and found the gadgets for the Windows Sidebar on my system and I am using both. I did find out which .dll he needs but couldn't find a copy of it for download.