I use Irfan View most of the time to resize images. It has a B-spline altenative to resize, almost as good as S-spline (another good program), but not freeware as Irfan View is. Irfan is very easy to use because you can just copy and paste images to it. After resizing they needs some sharpening, but so it is for other programs too. I have tried Genuine Fractals too, it is very good, but more difficult to handle.And it does not work in PSP only in Photoshop.