Bookmark & Share - The Power of the Button | OnlyWire -- I never used to use OnlyWire, but since they've done their big update... I've not been able to keep away.
All of the social bookmarking Web sites that they offer to submit to are actually in working order (unlike they used to be).
Their are, however, two cons... a) you have to place a bookmarklet button sitewide (which is not necessarily a bad thing, I would place one anyway) b) you can now only send a maximum of 5 API submissions (which disallows you to completely automate the process of bookmarking).
I see no extra effort in bookmarking your site with a form that is already half filled out for you, so long as you are bookmarking pages as you add them. It feels a little more time consuming when you're doing them in bulk.