Last month, RSA Labs announced that the RSA Factoring Challenge and the RC5 Secret-Key Challenge will
no longer be active. The RSA numbers and RC5 blocks are still available; RSA will simply stop giving prizes for solving them.
Of course, people can still try cracking them as a challenge, but I'm not too sure that the computing costs would be worth it.
On the brighter side, more people might focus their computing power on finding new Mersenne primes!