Have a facebook weather survey application. I also have a weather widget using AJAX and Scriptaculous library. The facebook application is developed using <fb:Iframe> and FBML.
1. weather widget displayed in one canvas page tab
2. weather widget displayed in facebook profile page
3. weather widget submits value to database (replaces survey form)
This is a simple integration task but you will need to familiarize yourself with the survey functions of my facebook application. Experienced facebook developers preferred.