Amazon has just made their new Kindle for PC available for pre-order online, a move that turns almost any PC in the entire world into a fully-fledged ereader. The software comes on the heels of all of the big Win7 announcements today evens up the playing fields when it comes to PC-based ereaders.
Amazon has long had the Kindle but Barnes & Noble launched a PC ereader long before Amazon, putting them at a disadvantage. B&N also has versions of their reader for OS X, BlackBerry smartphones, and the iPhone/Touch.
The PC version isn’t quite available – it’s still coming soon – but it’s currently floating around in Beta. The B&N app is right here.
I also have this song in my head:

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