www.mypoints.com and
www.points.com are two totally different websites that do two totally different things.
Mypoints is a shopping portal which allows you to earn points when you shop (among other ways)
Points.com is a tool to allow one to convert one company's points/miles to another (but at a very poor rate). I have ~2800 USAir miles and I think points.com will give me 142 AA miles, give or take.