They’d hinted toward the move earlier in the year by showing related market apps in search results, but now Google’s added an “Android Apps” tab to their mobile search site. You’ll initially find it under the “more” tab at the upper right of your screen. From there, just search for an app as you normally would the Android market.
“What’s the point,” right? I’m not exactly sure either, but I do tend to run into times where the Android market isn’t quite cooperating the way I’d like it to. (ROM users will know what I’m talking about after a fresh flash where the market’s chugging along as it tries to re-cache everything and repopulate the market database.) Other than that, there’s not much to it. Go ahead and try it out now.