4
I'm not sure if one of these icons would do any good on a normal XOOPS site. You could do it with some javascript.
These icons are normally used in ajax blocks or parts of a site; when a user performs a certain action, the icon shows while it's processing the request.
With php (such as xajax) and javascript (such as scriptaculous) libraries becoming easier and more powerfull to use, we should start seeing more XOOPS modules integrating them. Modules from Mcnaz and some of mine already use xajax while I've also seen modules use other php libraries.
[rant]
While the whole "web 2.0" might be a fad, making web pages more user friendly and interactive is definitly the way forward, and that's what ajax provides. No longer do we have to do a full page reload just to get a small piece of information.
[/rant]