OK, I checked the manual and bit 6 controls the external 0 flag. I set it to '1' for the rising edge.

INTCON2 = %0100000 ' External Interrupt Flag on Rising Edge

Do I have to set the PORTB pull up enable bit?

Also, RB0 will be read as an input (wired from the HWPM pin 17), so I will have to reconfigure my TRISB register to accept an input on PORTB, right?

thanks again for the help.