i don't really know enough about these two, does anyone have a good website for info about'em?
Well, basically and in layman's terms:
MacPherson struts are pictured here:
The STi has them at all four corners
As far as an example of a type of multi-link suspension..this one is off the new mini:
Basically as a car's suspension travels it changes every characteristic that a car has. toe, camber, etc.
"The MINI's multi-link rear suspension is unique in this segment. Its geometry is designed in such a way that the wheels always adjust to the best possible angle in relation to the road. The tires are therefore always in full contact with the tarmac. Changes in the camber of the road have no effect on steering or the car's traction."
The multi-link travels in a near up and down path, whereas the MacPherson struts move more at a inward curve, thus affecting the cars camber, etc. Control arms("A arms") do help the struts to keep a better "bite" on the road. The STi has lower control arms on all four corners. The Evo has lower control arms like the STi. The STi has MacPherson struts at all 4 corners and the Evo has them in the front with a rear multi-link.
A really nicely designed suspension is on the new 350Z. It has upper and lower, unequal control arms and a multi-link rear. I forget what it has in the front, but it does a good job of handling 3300+ car and a big ol' engine.