I saw the Gadget "Speed Test" and "Stock" in some Windows 7 books, but don't find it on Win 7?
There is a "Get more gadgets online" but they look quite 3rd party... and installing them might have some security risk?
Speed Test is here.
Several Stock quote gadgets are available here. Just take your pick.
As for the risk of installing them : There's always a risk, but you can minimize that by choosing gadgets that have good reviews, which means that they have passed some tests by other users.