>> Along the same lines its very important to make the user see that
>> something's happening which can be as simple as displaying an animated Gif.
>
>FWIW, I recently implemented the code found at http://blogs.crsw.com/mark/articles/642.aspx and I'm very happy with the results.

Yes, a busy box is fine, to limit people from multiple clicks and it works well if there are no scalability issues to start with.


Double clicks are probably the worst offender for causing sites to overload.