Similarly, you could go with a bubble chart, where the X and Y axis represent two of the parameters, and the third is represented by the size of a disk at that (X,Y). Another option might be a heat map, where the third parameter is represented by the color or brightness of the point at (X, Y).

Hope that helps.

(And after writing the above, I realize that all I did was re-organize what graff said. Reviewing some of the links (and their links), might lead you to some additional options.)