I got one of the Cables To Go VGA monitor splitters from global computing:
They still have them. and they are fairly cheap:
4-port unit is something like $60 and sometimes they offer a rebate. If you want to extend sound to the monitors then you need to get the one with audio as well (closer to $90).
They work quite well and extend the video signal range (supposedly to 200 ft).http://www.globalcomputer.com/applications/SearchTools/item-details.asp?EdpNo=485823&CatId=317
They used to have a less expensive 2-port splitter, but I would get a 4-port for flexibility (although you can daisy chain them).
If you are going to use the s-video option, then I am not sure what kind of splitter is available for that or the advantages or disadvantages of going this route.