Not as of yet. I cannot think of a sensible way to show many different sets of results at the same time. Unless you have a huge monitor, it would likely be too cluttered.
You can search multiple sites easily by typing in your search, then clicking on whatever providers (or typing into "filter"), and it will update the results. Or, you can hit [up] and [down] keys to toggle between search providers.
Yeah, I think the functionality of toggling between search providers is really well done. It just came to mind.
You know what be pretty amazing, IMO, is listing top 10 or so URL's of Bing, Yahoo, Google right next to each other for comparison sake (removing the display window).
You could enter your search, the middle click on the "Go" links for Bing, Yahoo, Google, and whatever else. This will open new tabs in your browser, containing the results for those search engines.
I really can't say I see much value in comparing 3 different search engine results at the same time. I'd rather just look at Google, then Bing, then Yahoo.
You can search multiple sites easily by typing in your search, then clicking on whatever providers (or typing into "filter"), and it will update the results. Or, you can hit [up] and [down] keys to toggle between search providers.