My wife gave me a Roku 2 XS for Christmas and I gave her a Nook Tablet which she asked for.
In both instances: basic setup of the device requests (in the case of the Roku, demands) a credit card or Paypal account to be registered with it. The concept of demanding a credit card in order to use a purchased product is just plain wrong, IMO.
The purpose of both of these devices is essentially to push paid content. Emphasis on "paid".
After a while of fishing around we determined that there appears to be absolutely no free content for the Nook except, perhaps, the contents of Project Gutenberg or something like that. I didn't really expect otherwise but I was surprised how effectively anything useful in terms of e-books is paywalled from the Nook.
The Roku, despite its absolute demand for a payment option in order to activate the device (evil in a box, IMO) - has a fairly rich library of channels containing free content. However, there is a clear food chain here.
The top of the food chain - such as major media news outlets such as Fox News, ABC/NBC/CBS, etc have "free" channels on Roku. However, when you browse their content, each channel is restricted to 3 minute or less clips of individual segments. You cannot watch an entire episode of "Red Eye" or ABC Evening News - you can only watch a short segment. I had hoped that each network would have a free live feed, but no dice.
The "bottom" of the food chain are a plethora of special interest channels, including Roku outlets for Chow.com and other niche stuff. (Get this - there is a channel for Drupal learning! Lol.) Basically these channels have full length programs but the sources are no-name.
The Roku would be OK if you already intended to subscribe to Netflix or Hulu. If you weren't intending this, it's quite frustrating.
DG9 - your comments about authoring content through the Roku network are really interesting. I didn't realize that developers were buying these things for non-passive use.
The Wii type remote control is quite innovative (I was amazed how well Angry Birds plays on it and that you point the controller to move the screen cursor.)
About the Nook, I'm telling my wife, hey! At least you now have that "laptop" type portable PC you always wanted, since the Nook works well as a web browser.