[apeine]

I'm very interested in buying a Nook color, even though I don't live in the US (I live in Brazil, actually), but I have a friend that will travel to the US by mid-march.
As I can see, one of its strongest point is its great hackability, which allows it to run as a Android 2.1 tablet (even 2.2!).
But I'd like to know a few things before buying, and I'd be glad if you people could help me:
1) On a review (at Cnet, I believe), people complained about compatibility issues with 802.11g wifi connection (slow or not reliable). Is it true? Reviews were from 6 weeks ago, maybe before the last upgrade from BN. And I wouldn't like to change my wifi router just because of this.
2) On the same reviews, people complained about video playing, which was skipping some frames. Is it true? I mean, in regular mp4 video (H264 vid + aac sound).
3) Can I buy book from abroad at B&N?
4) As I use lots (I mean, LOTS) of PDFs files for my master degree, I need some sort of annotation system. Is there anything like this straight out of the box? If not, is there any software that might do so? Unfortunately, some PDF were not passed through an OCR soft, so I guess they can't be converted to something better (epub or any other ebook format), which would allow annotation.
5) Any recommended covers, skins or accessories?
Thanks, folks!