Been playing around with the Raspberry Pi.....Have a digital temp probe, 8 port Relay board hooked up and tested. Realistically with no other hardware the PI will have enough pins to handle 6 or 7 outlets. I have modified some free available code and have it running a heater script now.... Its running Apache for web, SQL database, Python scripts. I think this will turn out to be a inexpensive alternative to monitor and control a small system. Has graphs, etc. Need more code work but it's getting there. Long term, will take all the wires and bring them to RJ type jacks for external cables to the temp probe, relays, etc.