Zeh a Brazilian Flash guy, has posted a very interesting article.

He’s currently researching for an interface design bachelor degree paper. In his search for some kind of holy grail, a paper that backs up every Flash designers argument that animation is a key factor in making better user experiences he found it.

One of the interesting things about the paper is that it was published 1993 (!) yet is incredibly relevant to Flash interface design. The original paper can be downloaded from here but I would recommend reading Zeh’s post first.