Thus, a Web form is almost always cleared when the user sees it. Even when a user revisits a form in a single session, it is usually faster to edit the old data than to erase it and start over. The answer lies in his usability. Jeeves is the kind of guy I love to use. Movement like this is distracting and keeps pulling one's eye away from the copy.
Research shows that animation generally drives people nuts.
But one of the features you might actually want to use is well, useless. Don't just trust your own judgment. If you think you've got all the bugs out, don't believe it. The most obvious problems are usually invisible, and watching someone new use your site can quickly reveal them. And try several users.