Welcome to MR, gsremn.
That was a very nice gift for your wife (didn't you get one too?).
Make sure to check out all the free ebooks on this site. They are beautifully formatted by some very dedicated MR members. Look up on the blue bar on the left (mobi prc).
I have the Sony 505 (love it!), so I don't have a lot of experience with the Kindle. Make sure to check out the Kindle forums for lots of information.
Jump in and ask if you have a question and a friendly forum member will answer or point you in the right direction.