Assuming you have just one VGA out:
I did a quick and dirty search at pricewatch.com.
I couldn't find a one size fits all adaptor but did find a couple when used together should work (for turning a tv into a second computer monitor).
http://www.callcct.com/s.nl/sc.2/cat...it.A/id.289/.f
This will split your VGA out into 2VGA outs.
http://www.cableclub.com/product_inf...roducts_id=460
and this will convert one of those VGA outs to an Svideo and/or RCA out.
With a bit more searching might have found a single adaptor to do both jobs.
A dual display card is a much better way to go if you can.
Sam