Social Bookmarking alternative

Magnolia is a new social bookmarking site that is similar to delicious but has the option of making bookmarks private too. It looks really nice and seems to have good integration through the use of bookmarklets. My Magnolia homepage is available and I've also started a geocaching group.
I've yet to import my bookmarks into the site (that will be a long job!) and the only downside I've had so far is the fact that adding bookmarks to a group is a pretty painful process - first you add the bookmark to your page, then you have to go back and add each one to the group, with a "choose the group" followed by "edit details" page - which takes a long time when populating a lot of links (which I guess will slow down the spammers!)