Sony eReader vs. Kindle2

What is the difference between the Kindle2 and Sony Touch Edition?

1st thing that hit me about the Sony; to download a book, you have to connect a USB cable to a laptop or stand alone PC connected to the internet, even though they have AT&T wireless for browsing. Per their web site: USB Port required for Reader connection.

[Nook has wireless downloads; Barnes and Noble's Nook has an expected shipping date Jan 4.]

*Kindle2 downloads wirelessly

*Kindle2 does not have an expandable memory

*Sony eReader is compatible with Mac and PC

*Sony eReader is compatible with multiple eBook stores

See Sony web site below for more info:

http://www.sonystyle.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10551&storeId=10151&langId=-1&categoryId=8198552921644523779&N=4294954529