Every web site has its own structure which also according to four situations - Scannability, Usability, Readability and Credibility.

Scannability which is to make keywords stand out, use highlighting liberally. By practice, 79% of Web users scan pages and not read word-by-word. Web document design should be scannable. A vivid headings and subheadings which are in readable type such as Yahoo search engine. Also, colored text backgrounds can be used for highlighting, but never use blue for words. Owing to that specific color is reserved for hyperlinks. Another essential is bulleted and numbered lists slow down the scanning eye and can draw attention and important points.
Usability is often making Web site useful to as many people as possible. Consistent color tone for Web frame and wordings will be advantage readers to scan through web page. Color is the main element that enhances usability; too much different colors only hinder readers from reading path.

Readability is eyetracking visualization show the readers oftern scan Web page as an F-shapped pattern like the Web page of JosDB.com. Usually, people using horizontal movement as their reading path. Across the upper part from the top to the center and down to bottom. Finally, a vertical movement on the left side of content. Deservedly, people are not exactly the same reading pathway. Sometimes E or L patterns go instead of F. However, it can be roughly resemble an F as dominant reading pattern.
Credibility is short of professionalism of web page which include high quality graphics, good writing, outbound hypertext, update pages and etc. The perception of credibility can goes a long way in reassuring users have reached a Web site that provides useful and consistent information. Also using "Marketese" language is necessary for building up its specialization. These are the things when designing web site to boost site credibility.
Referencing:
Yahoo Search Engine, Copyright © 2008 Yahoo! Hong Kong Limited
JobsDB.com, Copyright © 1998-2008 JobsDB Inc.
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