In Mac OS X 10.5 and below, the default behavior was to take screenshots (command-Shift-4) by creating a file on the desktop automatically named Picture 1.png. The second file would be created as Picture 2.png and so forth. In Snow Leopard though, the screen shots are named Screen shot followed by the date (YYYY-MM-DD) and then the time (HH.MM.SS). So if I took a screen shot at 3pm today it would be called “Screen shot 2009-08-31 at 3.01.05 PM”. This keeps them showing up in the same order they otherwise would have. At first I wasn’t sure whether I liked this change, but now I’m sure that I do. The defaults commands that were used to change the default image type and the location are still applicable.