2012: current uses of scrypt

As KDF in scrypt author's simple file encryption program
As KDF in Tarsnap, scrypt author's "online backups for the truly paranoid"
As KDF in Chromium OS to better protect the user's vault keyset
as well as to mitigate offline attacks on the Google Account password
As proof-of-work scheme in Litecoin, "a coin that is silver to Bitcoin's gold"
128 KB (misuse: too low) makes Litecoin ~10x faster to mine or GPUs than on CPUs
As KDF in Phidelius, constructing asymmetric keypairs from passwords

There's an RFC draft on scrypt
crypt(3) encoding syntax for scrypt is being considered