Ah, web email. That is what I thought. I was hoping that you had found an email app that I wasn’t aware of...
I have the 3G option on mine, and it is great for browing when wi-fi is not available.
Also keep in mind, if you find something on the Internet you feel would be a good book or article you want to keep (don’t bypass copywrite laws...), you can easily turn it into a Kindle book.
Copy/Paste it into your word processor and save it as an HTML file. Calibre will add HTML files to its database. Once in Calibre it’s easy to convert the HTML file into an ePub, MOBI or other book format. It also pertains to PDF files.