Sheesh, is this going to be Microsoft's enduring attitude? See something that's popular, copy it, try to make it a little better? I mean, there's Zune, Xbox, Bing, Bing Maps...the list goes on, but the newest addition is WorldWide Telescope.
Here's evidence that Microsoft isn't just up for challenging Google in the usual Web-search business, but in other Google areas too: Like Maps. Bing's just demonstrated some upcoming tweaks, and they'll make Google nervous.