I’ve arranged them by height:
Amazon Kindle 3: 7.5″ x 4.8″ x 0.335″ – 8.5-8.7 oz
Kobo Reader: 7.24″ x 4.72″ x 0.393″ – 7.795 oz
Sony Reader Touch 2: 6.62″ x 4.75″ x 0.4″ – 7.58 oz
Kobo eReader Touch: 6.5″ x 4.5″ x 0.4″ – 7.1 oz
Sony Reader Pocket: 6.25″ x 4.25″ x 0.41″ – 7.6 oz
Sony Reader Pocket 2: 5.75″ x 4.12″ x 0.34″ – 5.47 oz
It’s not as wee as the lust-o-licious second-gen Sony Pocket, but it’s $40 less and that’ll make up for it. It’s also a whopping $100 less than the Sony Touch Edition with identical 6″ screen.
Borders has a hell of a lot of work to do. This is your lifeline, Borders. Pimp the living hell out of it. Make room at the front of your stores to highlight it. Drop every other damn device. They’re not worth your effort. If you can’t sell a ton of these, what good are you to anyone?
Now I understand why major retailers have dumped the Sony Reader. They knew Kobo had this up its sleeve. Best Buy was smart for adding Kobo.
Mike Cane’s xBlog 
The fact that the new Kobo has Wi-Fi is the real kicker. No Sony except for the outrageously expensive $300 model has any wireless capability. If Kobo markets this properly, they’ll make a huge dent in Sony’s sales and will be a definite damper on B&N’s new device. As you correctly noted, B&N can’t compete with Kobo outside the US.
The old kobo had wifi. I’ve had one since December 2010 and it works with wifi. I just got the touch edition….much more responsive.
https://mikecanex.wordpress.com/2010/11/06/nano-fondle-kobo-wifi-reader/
Thanks for the size comparisons. I just bought a Kobo second hand, and I’m looking to dress it up in some clothes, and I couldn’t find sizes anywhere!