The Kindle web browser has two modes.
mode is a very simple browser that strips out the background, flash, etc. to show a page that is certain to be readable. This can take as much as 5 times as many screen pages to display.
mode treats the screen like a 600 by 800 monitor, and shows everthing.
Whenever you are viewing a page, try both modes. One might be better than the other.
It is possible to browse from your Kindle and download ebooks. Some sites that will work on the Kindle are: