Thanks xcubic.
Yes, I was playing with that idea, although I dislike the thought of having to register/login to yet another site. Maybe this is a good opportunity to try something else instead. The obvious options are logging in with facebook, github, etc. But maybe there is another way to conveniently couple users to their bookmarklets.
A directory is something that has been on my mind as well, this way people who are less tech-savvy can still profit of people who put a lot of effort into their bookmarklets.