For longer than I can remember, Bookdog has had the capability of sorting Safari bookmarks 3 minutes after the user added or changed a bookmark in Safari. This nifty feature that was made possible by the cooperative way in which Safari handled its bookmarks file. It was not possible with other browsers (Camino, Firefox, etc.)
With the release of Safari version 4, however, a user reported a crash, and I discovered that this was repeatable. The way to make it crash is:
Jerry Krinock