I got the Nook for Christmas and, so far, I'm in love with it! I am not a very techie person, but I love my Nook. I had wanted either the Kindle or Nook, but my brother decided the Nook was the better option for me and I think he was right. It's seriously awesome and I'm sure everyone who has received an e-reader will find theirs to be just as wonderful in the coming days, weeks, and months.
I'm not sure about all of the accessories for the Kindle, but, from what I understand, they are similar to what is available for the Nook. Along with my Nook, my brother purchased me a leather case. And, today, with money from Christmas, I went out and purchased a protective film kit so that my screen and touch screen would not get scratched. I highly recommend the film (the same that is used on touch screen phones and whatnot) as it does help reduce scratches, dings, and other accidents. And, the leather case is wonderful as well. I've seen neoprene cases and other types of cases, but I like mine the best - though it was pricey (per my brother it was $29.99). The protective film was $14.95.
My birthday is in just a couple of days and I know I'll be getting other Nook accessories and so I've made a list of what I want. I'll be getting an LED light as well as some gift cards. I saw the cases with the lights, but I prefer having them separate. But, that's just me. There are just so many accessories and so little time, lol. A lot of everything is not necessary, but I do think the case and the protective film are important. However, it's just up to you and what you like! I hope you love your Kindle as much as I love my Nook -- enjoy it! And, of course, keep us posted on what all you decide!