TrueCrypt (a popular open source encryption solution) has recently shut down. In the last 24 hours, its website was updated with a message informing visitors that the solution is considered harmful and shouldn’t be used. Development was halted when Microsoft stopped supporting Windows XP in May and users have been advised to start using Microsoft BitLocker instead. For those still interested in using TrueCrypt, a noteworthy change has been made in that it now only decrypts data and you can no longer encrypt it.
More information regarding this discovery, including the possibility that this might simply be a form of compliance with an NSA request, can be found at:

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