Official Google Blog: Eye-tracking studies: more than meets the eye
http://googleblog.blogspot.com/2009/02/eye-tracking-studies-more-than-meets.html
googleblog
An eye tracking study from Google. However, please note that none of the searches are overly commercial in nature (no top position ads). In almost all G heatmap studies, they only show mostly information searches. Interesting data, but don't assume your ad will not get nice visibility for more commercial based searches.Web forms design guidelines: an eyetracking study | cxpartners
Provides 10 guidelines for web forms, based on eye tracking research
Guidelines 5 - Don’t use asterisks, make clear optional fields Guideline 6 - Use single field for numbers or postcode
Estudo sobre formulários online