The DR800SG came out about a month ago, and it shares a trait with most other ereaders with a wireless connection: you can't use it to browse the web. The wireless connection costs money, and naturally Irex (and their business partners) only want you to use it to access their ebookstore.
Most of the other ereaders don't have a browser, and that's a sure fire way to block browsing. The DR800 is different, though. One of the formats that it reads is html, so it requires at least a minimal browser. An inquisitive MR member stumbled across a loophole, and discovered how to trick the DR800 into browsing the web.
The trick is actually very simple; I'm surprised Irex missed it. First you have to enable the folder hack. You might want to get help for that one. Then all you need is an html file with a link to a website (Google would work).