His arguments:

1) If the salts are stored in the database with the hashes, wouldn't it still be possible to brute-force/attack the salt+hash combination?

2) In the context of [0], don't advances in parallel computing (particularly wrt. "general-purpose" computing on GPUs) make it relatively easy to generate a rainbow table for each salt encountered (compared to, say, two, or even seven years ago)?

[0] http://stackoverflow.com/questions/5252943/why-we-use-the-salt-to-secure-our-passwords