Hi there,
I tried to uninstall Arduino on my mac (snow leopard) and reinstall it. I deleted Arduino by dropping it into the trash and it disappeared in the Application Folder. Every time I drop the new Arduino app into the Applications Folder a window pops up with the comment that there is already an existing Arduino installation. When I check the Application Folder a crossed Arduino Logo appears which doens't work when it is selected. Any experience with this issue?