It remembers the last folder chosen, but doesn't remember a folder previous to that... not very useful if you want to switch between several collections of your own.

The fact that Apple gave us the ability to change folders and collections without giving us an easy way to switch between our own custom collections is disappointing. At the very least, it should simply recognize any folder within either /Library/Desktop Pictures folder for the pop-up selector on the prefpane.

Another advantage of this hint's method is that it allows you to use custom collections and the Finder's default crossfade transition. Both ChangeDesktop (which I used for awhile) and SwitchPic (which, IMO, needs an interface overhaul) simply swap the image.

The cross fade is so much more elegant I consider the extra effort to be worth it.

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It's a little more starry eyed than thin-lipped.
http://regency.newarcadia.com/