I wrote up an article doing my best to explain how to use both selecable and draggable UI elements to work together to select a group and to drag them. I Richard. Worth helped me about a year ago to try to figure it out, but it was kind of buggy, then I asked him if he found a solution, so I decided to write an article about it and share it since I know I am not that only one who wants to know how to do this.
Link: http://www.ryancoughlin.com/2008/11/23/combining-selectables-and-draggables-using-jquery-ui/ Thank you, Ryan