http://news.bbc.co.uk/1/hi/technology/5038330.stm
Analysis of Archiveus has revealed that the password to unlock the file containing all the hijacked files is contained within the code of the virus itself.
The 30-digit password locking the files is "mf2lro8sw03ufvnsq034jfowr18f3cszc20vmw". Using the password should restore all the hijacked files.
Now the password has been uncovered, there should be no reason for anyone hit by this ransomware attack to have to make any payments to the criminals behind it.