Yes, I just purchased a 9pin to 6pin cable from monoprice.com for my new 13" MacBook Pro. I installed an SSD and threw the 250gb hard drive in a firewire enclosure, and all works well. The cable + shipping was under 6 bucks, and the quality of monoprice stuff is hard to beat.
That reminds me, I need to get a stereo mini jack to optical cable