http://www.google.com/support/forum/p/Web+Search/thread?tid=0c6f83325492ed66&hl=en

There’s a lot of whining about Google going mainstream, “chasing Microsoft”…and how “now it looks just like Bing.” I wonder if it occurred to any of these people that the reason that’s true is because Bing is a direct copy of the Google layout? They added some color to the header, and some suggested results in the side bar, but everything else—location of sponsored links, link colors, description layout and colors, url color, additional options—is an imitation of what Google pioneered.

So they added a sidebar, so what…you’ll get used to it, and it’ll be fine.