and do not put a bunch of stuff all over the place.
If the program did not come with an uninstaller, some do, most don't, follow the instructions below.
Go to your applications folder and drag that program into the trash. If you wanted to get really energetic, you could also go to your Preferences folder, inside your Library folder, and delete the programs preference file.
I have downloaded a photo manipulation programme to see if I like it - but I don't. How do I uninstall it? In Windows there is the control panel with the uninstall feature, but I cannot find anything similar in my Mac (OS X 10.6.4)