arc90 has a free service called Readability which is invaluable for reading articles on the web. In a nutshell, it strips out all the extraneous content on a page and presents just the main article text, in a beautifully formatted way. You can configure the way the final page is rendered using the previously linked page, with such options as margin width, text size, the ability to convert hyperlinks to footnotes to avoid distraction, and a few different typographical options. Once you’ve done that, you merely drag button up to your bookmarks as a link; whenever you’re on a page that’s overly busy, you just choose that bookmark and the page instantly converts to a more readable document.
The one drawback I’ve found is that nicely formatted code in an original document does not come out that way in the Readability version. Still, if what you’re reading is not full of source code, this site is absolutely vital.