According to Majestic Research, Google Search accounted for only 21 percent of the time that U.S. visitors spent on the Google site during June. In contrast, 45 percent of the time was spent on Gmail. Yahoo visitors spend only 2 percent of their time searching, while 42 percent of their time they used Yahoo Mail [...]

These tools will let you see if Google has any problems accessing your pages. Google Cache Checking Tool Checks whether URL(s) have been cached by Google and the date they were cached. Search Engine Spider Simulator Lets you see through the eyes of spiders.

The Principles of Design explains the core elements of visual design: Balance Rhythm Proportion Dominance Unity Make sure to read the article. It will help you make better user interfaces.