Perhaps this is a known Cool Thing. Looking at my Aero GUI in its visual detail, I noticed that the drop down control on the IE SearchBar was orange (not my preferred color in my otherwise forest green theme).
Well, at least my attention was focused on something other than dark energy and fundamentalism, so I decided to add a new search provider.
For the first time ever, I saw a new context menu entry - Add Search Providers. Find More Providers is also on the menu. My mouse focused there and Seven Forums popped out. I selected it. Now I can search SF from the IE SearchBar.
The icon is a bit non-descript.