I’ve always liked the idea of del.icio.us and do kind of use it, but the website itself was never really “delicious”. Yes, it did do what it had to do, but you wouldn’t really consider it a pretty interface. This all is seeming to change though. Techcrunch showed some screenshots of the new website here.
I really like the new look; it seems much more userfriendly. They’ve also added some needed searching and tagging functionalities. You can request an invite, but at the moment they’ll just put you on the waiting list.