The release from the first link you posted is actually an container for a virtual machine - which is different thing from the Visual Studio product itself. Clicking on link with the more information about it reveals that:
"This virtual machine is based on trial software which will expire on September 10, 2012."
(It is written here: http://blogs.msdn.com/b/briankel/archive/2010/06/25/now-available-visual-studio-2010-rtm-virtual-machine-with-sample-data-and-hands-on-labs.aspx )

So the short answer is - The first link you gave points to a trial and the second link points to the actual product.

The release from the first link you posted is actually an container for a virtual machine - which is different thing from the Visual Studio product itself. Clicking on link with the more information about it reveals that:

its free for student and teacher.. thats it.. more complicate projects u need to buy it..i mean for compinies that make games or something else

I think there is a free version "Visual Studio Express". It is not supposed to be used for commercial applications.

I did a search on "Visual Studio Express" on the microsoft site. Sure there is that. But I also found that I can download the beta of what looks like the next version:
http://www.microsoft.com/visualstudio/en-us/products/2010-editions/express
It is called Visual Studio 11
http://www.microsoft.com/visualstudio/11/en-us/downloads#express

I am installinb Visual Studio 11 Beta Ultimate right now. The little graphics for the progression bar looks cool. New things are cool

Remember beta versions usually expire when the production release becomes available.

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