No, not wheel spinners! You’ve seen these animated gif’s used in AJAX apps to indicate that an operation of undetermined duration which might or might not complete is in progress. Here:

If you are after these here is good web site to automagically create them.

And you can use them in desktop apps too. I used animated gif in TweetPow while tweets are being loaded, because you know, that perfectly defines an operation of undetermined duration which might or might not complete…

Anyway, for desktop apps, simply add them to the PictureBox and voila, they spin.