@mamaz: Well, it would be fair to say that the Nook Color battery life is dismal when compared to pure eink devices like the Kindles, which can go at least a couple weeks between charges on average [depending on usage of course]. So yes, a few days as boswd indicates could be fairly construed as "dismal".
Still, IMO, 4 days for a Nook Color between charges is indeed quite sweet, especially given the excellent screen and the potential, very-tablet-like functionality.
Of course, non-stop Angry Birds activity will likely reduce this quite a bit. Not to worry though as I would think your new DIL will have her hands full already.
Clearly, between these 2 choices, I think it safe to say if you are desiring "bells and whistles" and "wow factor", the Nook Color is IMO the obvious way to go.
Bottom line: I predict she will be delighted with whichever one you choose to go for.
cheers!
-les
EDIT: Not meaning to confuse the issue more for you, but perhaps another device to consider: The Samsung Galaxy Tab. I have seen deals for the original Tab [like I have] for around 350USD.
With the Tab you get a full blown Android tablet device and everything that comes along with such things. I love the form factor and there are any number of excellent ereader apps [free!] for Android. ereading on my Tab is awesome, but not so great in sunlight, at least not without cranking up the screen brightness to max [which obviously negatively impacts battery life]. I have been reading quite a lot on my Tab of late and with stuff like Wifi off and treating my Tab purely as an ereader [OK, with music playing as well] I was getting around 2 days between charges.
This is not so bad, especially if one gets a charger at home and one at the office as I do with pretty much all my portable gear.
CAVEAT: I do not use my Tab as a phone with SIM card here in Hong Kong - for online access I only use Wifi, either my own at home, at the office or perhaps at free hotspots. So in this sense, I am not using my Tab to full capacity. Should you go with a Tab and want to get a 3G data/voice package, do consider the monthly fees as well.
But certainly the Tab works quite nicely as I am utilizing it, via Wifi only when I want it and Wifi is accessible.
Confusing, ain't it?