What I think is funny about this example is that search for ADO.NET on the sneaky Microsoft Google search (http://www.google.com/microsoft) won't work. Give it a shot.
As sirshannon pointed out in the comments, using quotes around it will work. Escaping the dot will also do the trick, bringing back the same results (ie search for "ado\.net" without the quotes).
Must be a reserved character or something.