As per the title, I need a quiet FW 800 drive. I currently have a MyBook Pro 500 GB which sounds like a dishwasher whenever it's in operation. I've had to stop using Time Machine because it's so annoying....
another vote for a fanless (or quietly fanned) enclosure.
I also have a 500 GB mybook pro, and I also find it annoying that an external hard drive is louder than my mac pro.
It's pricey, but the G-Drive Q is a fanless external drive; very nice-looking... I just ordered a 500GB model.. http://www.g-technology.com/Products/G-DRIVEQ.cfm
It's pricey, but the G-Drive Q is a fanless external drive; very nice-looking...