Rule of Thirds

Rule of thirds is when the center/main point of the picture is a third of the way across the page.

Examples:

http://cameras.about.com/od/cameratips/ss/beachpictures_2.htm

http://haribololz.wordpress.com/2011/09/08/task-well-frames-images/

http://mhsdigitalimagingcolemanl.blogspot.com/2010_10_01_archive.html

http://blog.webshots.com/2007/09/pro-tip-rule-of-thirds/

http://www.flickr.com/groups/sharingexposures/discuss/72157607652835983/