PaidContent.org has posted a nice table comparing the features and capabilities of a number of tablets and e-readers from Amazon (various Kindles, including the Fire tablet), Barnes and Noble (various Nooks, including the Nook Tablet), Sony (the WiFi reader), and Kobo (Touch and the Vox tablet.) It’s a good place to start if you’re considering purchasing an e-reader or tablet for yourself or as a holiday gift.
Conspicuously absent from the chart, however, is Apple’s iPad. For that, you’ll have to look at The Verge’s comparison of the iPad, Kindle Fire, Nook Touch, and Nook Color tablets. Unfortunately, this one doesn’t include Kobo’s Vox.
Finally, if you’re specifically after tablet that’s less expensive than the iPad, you might want to read Amy Gahran’s piece on smaller, cheaper tablets over at CNN.com.