Nice try, Eager Beaver, but;
-That ones collision detection is no better than a simple: "If the distance between them will be the averaged(?) radius next frame, then they have collided".
-They also, oddly, have also decided that: "at exactly halfway between the frames they have collided"
-The collision calculation is actually exactly the same as the one newblack gave me, except that it doesn't take into account masses. (They just named the variables differently)

Also, @newblack; I see the dot product now! Aren't you proud?
I've also figured out the calculations for an exact collision from circle to a rectangle (I think)!