Hi,
Since neither the search function nor Google showed any solution, so here's my question:

Does anyone know how to move programs around in the taskbar? I would like to arrange my programs in a certain way, so I don't have to look for them when I have to switch quickly. I do know about Alt+Tab, but it doesn't work right for me.?

Any help would be greatly appreciated :)

I don't believe it's possible. They appear there in the order in which the programs were opened. Sorry.

I have what you're looking for. It's a program called IconDesk and it works perfectly. You can get it here:
http://byukruk.tripod.com/

Xneat at moving programs in WinXP taskbar (http://www.xneat.com/) do exactly what you want..

Below is a screenshot of it working

http://www.xneat.com/images/screenshoots/taskbar.gif