I work with Ubicom microcontrollers (100MIPS, compatible with PIC16C5X) now and maintain Ubicom Net Resources site - more than 100 links now.
Please go the PICLIST.COM with all PIC-related questions. You will also find many Ubicom resources here.
If you are interested, old Microchip Net Resources page is still here (not updated from 31-Jul-1999), more than 500000 visitors from 1996...