Retrocomputing Gadgets I'd Like to See (Apple)

If I had the time, I would look into using Express PCB (or something similar) to build a serial card for the venerable old Apple2, based on some kind of UART that has a FIFO in it, for example, the 16550. By having the UART buffer bytes, it seems like it ought to be possible to attain higher baud rates than just clunky old 2400. Of course the challenge would be to make it compatible with the 'super serial card' - which might be just not possible, as the old machines exposed a lot of hardware to the software. Anyway, if I could just IN#1 with it I'd be happy. If anyone goes for it, post it to applefritter and/or let me know!