Besides showing off the new hubs, multitasking, IE9 and Skydrive support coming later in 2011 (and those were only the announced features, there's evidently a lot more), there was one surprise app that we saw: Groupon (see their site)

For those who haven't been following, Groupon is the biggest "deal" website on the 'net, helping consumers find the best offers and lowest prices for a variety of items and services. They're also known for turning down a $6 billion offer from Google to buy them out. Yes, we said billion.

Some of Black Friday's best deals are still available, shop NOW before they're gone

Anyways, this super service is coming to Windows Phone in an official capacity sometime soon--and it even features a Live Tile with updated deals (similar to that just-as-awesome Slick Deals app available now). All we know is this is great news for WP7 to land yet another major brand.

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