The Philips P89C51RX2 is a popular part(replace X with A,B,C, or D for size of program mem). It supports ISP and IAP programming. You can design your hardware to enter and exit ISP mode using serial control pins so jumpers are not necessary. That makes for easy programming.

I plan on trying out a Cygnal chip on my next project. They use JTAG for programming and debugging. The final hardware would require only a JTAG header. Michael Karas has pretty much sold me on that brand. I hope the switch won't be too difficult.

- Lee