In case you haven't come across it yet, the IUCN (International Union for Conservation of Nature) are marking the UN International Year of Biodiversity with the Species of the Day website. All of the organisms listed are on the IUCN's Red List (a list of the conservation status of plants and animals). It's a scary thought that the 365 days of 2010 will only give the IUCN the opportunity to highlight the tip of the iceberg in terms of organisms facing extinction.
Today's critically endangered organism is the Silky Anteater, but if you click on the link above on another day, it will feature another organism that, without intervention of some kind (such as habitat preservation) could disappear from the Earth for ever. Many of which you and I would not even have heard of. Organisms already featured include the Mountain Tapir (I have a soft spot for tapirs), the Djibouti Francolin, the Sea Marigold, the Boreal Felt Lichen, and the delightfully named Demonic Poison Frog.
*A wonderful phrase my mum used to say to us when we wanted more of something very nice but in limited supply - cake, biscuits, ice creams and so on. Generally, however, there is more cake. There won't be more mountain tapirs :-(