Mobile World Congress is all wrapped up, and while it was a lot of work, it was a lot of fun, too.  And there was a hardware announcement or two in there as well!  We saw tablets, fire-breathing CPUs, Facebook phones (yes, I'm hanging on to that no matter what Zuck says!) and even 3D.  It was a lot to cover, and a lot to digest.  I'll admit, I was a bit intimidated at first, but we've got one hell of a great crew here at Android Central, and we weren't about to let little things like sleep stand in our way.  Hat's off to all my friends and co-workers here, as well as our trio of traveling editors who worked so hard to bring it to all of us.

But when it's all said and done, the most important part of Android Central is you guys.  Without you, there would be no reason to go halfway across the globe and get packed into conference halls filled with mediocre techno-music, just to catch a glimpse of whats coming from manufacturers.  While Phil, Dieter, and Daniel recover, we're going to ask you guys to share your favorite news from Barcelona this year.  So have a look at what all went down at MWC11, then head into the forums to let us and your fellow members know what you think is the best of Mobile World Congress 2011.  

There's really only one way to describe Google's Android booth -- and even "booth" doesn't do it justice, it's more like half a hall at Fira de Barcelona.

It's epic.

First off, to borrow the infamous line from Microsoft CEO Steve Ballmer -- developers, developers, developers. Google had a couple dozen or so developers on hand to show off their apps -- a good many on the Motorola Xoom with Honeycomb. Some we saw at the Honeycomb event a couple weeks ago, others were new.

Dominating the joint was a giant Android robot, with a slide -- yeah, a slide -- snaking around it. More on that in a minute.

There were a couple of spots for passers-by to be Androidified -- that app that came out this week that turns your picture into an Android-type avatar.

And the smoothie bar -- yeah, there is a smoothie bar -- ¡Muy bien! You could get Cupcake, Donut, Froyo or Honeycomb flavors.

No, not done yet. Remember the showcase of Android phones back at Google IO in May 2010? It's now a train that stretches probably a good 50 feet or so, with just about any Android device you can think of on board. Stuff we've never seen, even.

Talk is cheap, though. Check out the photo gallery -- and more on that slide -- after the break.

While we've been following Viewsonic's tablets for some time now, we haven't yet paid much attention to what, if any, phone efforts they've made in the past. We can't really promise that will change in the future now that we've had some hands-on time with the decidedly utilitarian ViewPad 4. It's not that there's anything wrong with a blocky, squarish, bare-bones Android phone, it's just that there isn't anything particularly inspiring to be had here. Granted, we had a prototype here, as they hadn't yet even loaded up Google's apps on the device.

Spec-wise, we have a 4.1" 800x480 screen, a 1GHz Qualcomm MSM 8255 with Quad-band GSM, 512MB RAM and 2GB storage, Bluetooth 3.0, a 5mp camera (720p video) on the rear and VGA on the front, and a 1400 mAh battery powering it all. Sort of amazing to be ho-humming specs like that because there's really nothing to complain about. Hey, it's running Android 2.4 Gingerbread, so maybe a little more wide-eyed wonder is called for - we'll see how we feel when we find out pricing and availability later this year.

Check out some photos and a video after the break

NVIDIA rocked Barcelona with a demo of their upcoming quad-core Tegra CPU, project KAL-EL at Mobile World Congress.  It's all part of their roadmap which promises 75 times the performance of the current Tegra 2 by 2014.  Yes, you read that right -- 75 times the performance.  Back to the here and now, the KAL-EL, demoed on an prototype Android tablet had five times the raw performance of the current Tegra 2, rendering full screen video at 1440p running on a 2560×1600 display.

With it's 12 core GeForce GPU, this thing is going to be insane.  Partners have the chip in hand, and we're to expect devices, tablets naturally, using this gear by Aug 2011.  NVIDIA has more to say tomorrow, we'll be sure to stay on top of this one.  [NVIDIA]