Every day, not just on the Super Bowl.

I have the Giants/Cowboys game on in the background (in HD) and had it on TSN when they went to commercial. On came a crappy SD commercial or Canadian Tire or something else I've seen a million times.

Switched to NBC-HD just in time to see a really cool Nike add where they had the linebacker go end to end through different teams and weather, changing from home to away jerseys, making tackles all the way down. He hits the QB who fumbles to a running back on the goal line who then runs all the way to the other goal line with the same type of changes. The blends and transitions were completely seamless. And the commercial was in HD. Awesome.