The giant Mimivirus

The French have found a giant virus in a British water cooling tower. The virus lives in single-celled organisms called amoebae and may be able to infect humans.
The big squid

As reported by the BBC, an absolutely spectacular new specimen of a so-called “colossal squid” or Mesonychoteuthis hamiltoni has been found on the surface of the Ross Sea. Previously only six specimens of this type of squid have ever been recovered.
(Source: Sci-Fi Today)
Jupiter has more moons

AP reports that six more moons have been found orbiting Jupiter, bringing the total number of satellites to 58.