I have the the Kindle 3G + Wi-Fi and the Lighted Leather Cover and I love it!
I have been able to download books and surf the web in Shenzhen, China (google works too!). The text to speech feature is a nice bonus when I am unable to read due to a bumpy bus ride (note that some books do not have this feature enabled).
Mobile websites work great on the Kindle. I use
http://cantoni.mobi as a home page/launching pad to mobile websites.
Books, Games, Podcasts, MP3s, PDFs, Web access... It's not perfect, but I love it!