It appears that whenever I try to add a bookmark in Safari, it adds it to the homescreen by default. This occurs whether I select "Add Bookmark" or "Add to Homescreen". I've never had this problem prior to updating to the 3.0 firmware.
I do not have this problem. Did you restore with a backup in iTunes or Fresh. If you restored with a backup this could be yet another side effect of a jailbroken restore from 2.2.1 used in 3.0