I'm just starting out w/ PIC's, so my question is a wee bit premature, but..

How do you do multi-channel serial, at different clock rates w/ a PIC? My
intended application is reading an A/D and a PC keyboard and shoving the
combined data out an RS-232 port.
Is this feasible to do in software w/ a pic? Should I just use a parallel
output ADC and a UART,
leaving only the keyboard to software?

Regards,
nate