I did a search for Needham, MA 02494 on Google and got the onebox result with a Google map right on top.
Just below that happened to be a Yahoo! Maps result with the little button that allows you to expand a map in the SRP. And not as a surprise to me but maybe to quite some people – even so the title reads “Yahoo! Maps – Needham, MA 02494, United States” – the map was a Google Map.