I've gotten by on my Mac for nearly two years and apparently, I don't know how to properly manage/install programs. Let's take Tweetie for instance. I download the application, place it on my dock and use it for the time being. Then one fabulous day I decide.....wow, my downloads folder is ridiculous......delete.....uh oh....where did Tweetie go? What am I doing wrong? How can I better manage the programs that I do install?