Found an interesting article: About Secure Password Hashing.
Today I read Salted Password Hashing – Doing it Right which was a good run-down on how to do password hashing. The article linked to phpass: Portable PHP password hashing framework which is a library for hashing passwords.
I was looking for a good overview article that explained the process of password hashing and I found Password Encryption, Hashing, Salting Explained which was a pretty good run down.
On a related note I reread the Wikipedia page on HMAC.