% cd ~/.TrashMy trash was 4931400 bytes; about time I emptied!
% du -s
[Editor's note: You can accomplish the same result without using the terminal. Select Go -> Go to Folder (or command-tilde) in the Finder and enter ~/.Trash. You'll now see a semi-transparent '.Trash' folder in your main Finder window. Click on it and do Show Info (command-I) and you should see how much stuff is in the trash.]

