I've been using Disk Utility a lot lately to make disk images from folders. The process is somewhat tedious, so I searched Hints for alternative methods. In this hint, I learned that in 10.2 there was an application called Disk Copy that supported drag-and-drop onto its dock icon. When Disk Copy's functionality was later rolled into 10.3's Disk Utility, the feature was quietly dropped.
In 10.4, this feature has apparently been quietly reintroduced. Dragging and dropping a folder on Disk Utility's dock icon once again results in a prompt to create a new disk image using the dropped folder.

