FYI,
I remember
FTDI came up in a thread or two (I believe about CAN?). Since I actually use (and I use that term loosely since the units haven't been touched in 6+ months) their chipset, I dropped them a note yesterday inquiring about Intel Mac support.
Their response was quick and surprising as they attached a beta version of the driver for me (guess I need a new Mac to test it out

). I don't know their policy, so i'm not going to attach it, but if anyone does have a Intel Mac (am I the only one that keeps think of them as "I" Macs?) and is using something with the FTDI chipset just drop them a note.
I also sent a note to IOGear as I use their Serial -> USB dongle, but haven't heard from them yet. I will pass on that info too when/if I hear back.
-dave