Many OS X applications are distributed via disk images containing the application, readme files and documentation at the top level of the disk. This can be inconvenient because it requires you to create a new enclosing folder on your hard drive before copying the files.
In OS 9, dragging the disk image to a folder would create a new subfolder with the same name and contents as the disk image, but this no longer works in OS X. However, you can control-click on the disk image to use the new copy and paste files feature of OS X to accomplish the same result.
[Editor's note: Actually, it's even easier than that. Simply option-drag the disk image to the location where you'd like it installed, and it will create a new folder with the same name as the disk image.]
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