Christian Gilbert seems to be an organized soul, as evidenced by his email request:
Is there any way to alphabetize the bookmarks collections in Safari?
Sure. If you’re running Mac OS X 10.4, take a look at Sheep Systems’ $10 Bookdog. Not only can it sort your bookmarks seven ways from Sunday, it can also remove duplicate bookmarks.
If you’re running Mac OS X 10.2 - 10.3.8 (not compatible with 10.3.9), try the company’s free Safari Sorter.