Today, everyone offers tagging and 'social' bookmarking at some level. Even Google joined the fray (article). And companies like ma.gnolia, though not offering anything unique (atleast in the beta) are trying to come up with a better and faster interface than others. I just got invited to the beta test, and their bookmarking is slightly more tedious than del.icio.us'. But it got me making my own bookmarklet, because the one that they gave didn't work. You can grab it here if you want! (ma.gnolia ). Webosphere is touting ma.gnolia as the del.icio.us killer...! I won't go as far as that, especially after seeing its beta phase features and offers.
Flickr lets you bookmark photos, and now a company called Dabble, is giving you the option of tagging and organising videos. They offer a sleek interface, with audio and image bookmarking options coming soon.
All these services only clutter the space, in place of innvating. They are going Microsoft's way, and the reason people don't like them too much. They are trying to rewrite what exists, instead of building on it and making something more useful and amazing. I hope they realise this sooner, so that we can benefit faster and the web 2.0 burst continues longer!