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Detect zero cross point for switching relay on or off. 
That way there will be minimal arching.
You could use a TRIAC - same as light dimmer circuits.
Jus make sure you wire TRIAC correctly as I have blown up a PIC/RS232
port that way :-(

 
> What's a good way for a PIC to control (on/off) a crockpot? (120 VAC,
a
> couple hundred watts.)
> "Good" in this case means simple, cheap, and most importantly, safe.
I'm a
> bit scared of high voltage, and I consider anything over 5V high :)
I'd
> just go with a relay, but I expect there'll be arcing when the
contacts
> close and that makes me nervous. Better ideas?
> 

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