Well, there IS the option of getting an I2C based Fan controller that does Speed. The fan would have to have a Tach Output feedback to the chip (Maxim 6651) but that would require more programming on someone's behalf. The Circuit would also be a little bigger simply because the 6651 is a 16pin IC. (controls up to 4 fans which is kinda cool).

This works for me.. <shrug>

-Ben-O-Rama