When I bought my Kindle, I thought the dictionary and wireless were nice options, but that I really would not use the. However, I find that I use the wireless a lot. I like to download samples, and would hate to think that I get started on a book and then have to wait until I get home for download the rest. I also use the dictionary a lot more than I thought. It is so easy to look up a word and not have to sit and figure out the definition just from the useage.
Just my $.02