I always right-click and "open in new tab" (or new window for IE).
It doesn't make sense to keep hitting the back button when you want to get back to the results page. Much quicker to open in new tab or window than to keep going back and reloading that search results page.
It's also better if you want to keep one of the search results open to compare with other search results.
It also helps to open in new windows when you never know that some keyword is going to trigger pop-up killer, that kills the current window and thus your search results... better to lose a child window than to have to redo the search.
Usually the browser settings can be set to retain the search data... IE does a good job IIRC, Mozilla not as well; I turned all that stuff off for privacy reasons and just use the right-click method; using so many different computers, I can never remember which ones have what settings, but right-click is consistent across computers and most browsers have open in new window function.