Wire Frame and Eye Tracking

More information is to be found on http://www.useit.com/alertbox/reading_pattern.html
A snippet from their finding states:

• Users won't read your text thoroughly in a word-by-word manner. Exhaustive reading is rare, especially when prospective customers are conducting their initial research to compile a shortlist of vendors. Yes, some people will read more, but most won't.
• The first two paragraphs must state the most important information. There's some hope that users will actually read this material, though they'll probably read more of the first paragraph than the second.
• Start subheads, paragraphs, and bullet points with information-carrying words that users will notice when scanning down the left side of your content in the final stem of their F-behavior. They'll read the third word on a line much less often than the first two words.

Another article that deserves to be read is http://www.useit.com/alertbox/nanocontent.html which talks about how much people read in each line.