Moofmarks 1.6.2 adds mouseover selection
I really should have implemented this a long time ago, but I was too lazy. Anyway, Moofmarks now highlights bookmarks as you move the mouse over them, and you can click anywhere on a bookmark row to open the bookmark.
Safari 5.1 users note: If you’re using the popover version of the Moofmarks dialog, mouseover highlighting won’t for you until you update to Safari 5.1.2, which will be released soon.

