Or one after the other (which is maybe what you mean).
I like the idea of the interface. It would be nice if you could set the circle and then search for various categories within that setting... as you might want to do when you were planning a trip. Also, with local trip planning in mind, I'd like to have circles that can be set as named defaults. It's frustrating that right now the search reverts to a wide each time I change the search phrase.
Also, I note that there's no way to set the number of results, something that would be nice with the circle interface. As I expand or move the circle, some results that I'd like to keep under consideration drop out, which again makes the map difficult to use as a planning tool.
The fixed width of the page (c975px on my 1280x1020 monitor) also makes the whole interface a little claustrophobic. Additionally, while Yahoo's map is small compared to Google's, Yahoo shows 7-lines of text per result in the left column, compared to Google's 3-lines of text per result... so not only is a lot of scrolling involved in Yahoo, but when you scroll you're scrolling the whole page, so the map disappears very quickly. You've often got to scroll the whole page up and down to look at the map and then check a corresponding description. On Google Maps, the map stays visible at all times and you just scroll the left text column.
So, Yahoo does have more work to do, but it's a nice idea.