I used to think that it was very cool to simply drag the application in the trash from the applications folder to uninstall it. This is nearly the only way of uninstalling applications that don't include an uninstaller. The problem is however, that some files remain on your system forever, until you reinstall the OS. There is a nice freeware called AppCleaner that lets you select an application to uninstall. The app will find every files related to that application on your hard drive. What is even better is that you can go through the list of files to be removed before actually deleting them. It will avoid the app mistakingly deleting a very important file. After trying it for a while, I think it works pretty well. You can download AppCleaner here from MacUpdate.