Here is the questions posed to the Stack Overflow audience, however its from 2009[1]. The linked article says that they can now get collisions in about 2^52 operations- as opposed to the previous 2^69.
The National Institute of Standards and Technology has urged Federal agencies to stop using SHA1 digital signatures by the end of 2010, and instead start transitioning to the SHA2 family[3].
The National Institute of Standards and Technology has urged Federal agencies to stop using SHA1 digital signatures by the end of 2010, and instead start transitioning to the SHA2 family[3].
[1] http://stackoverflow.com/questions/1147830/understanding-sha...
[2] http://www.schneier.com/blog/archives/2005/02/sha1_broken.ht...
[3] http://csrc.nist.gov/groups/ST/hash/statement.html