Here is the promised tutorial on using the Sonia Kashuk Blending Sponge. Excuse the stains on mine. No matter what I do, the stains don't ever go out.
Dot foundation on your face. I like to do this because I find that I use less product than if I were to put it ont he back of my hand and then transfer it to my face with a brush or sponge.
Bounce the round side of the blending sponge over the foundation. Keep bouncing it to spread the foundation.
Dot some concealor on problem areas with the pointy side of the sponge.
With the pointy side, blend the cocnealor into the nooks and crannies of the area. I love this side of the sponge as it really lets me get great application on my under-eyes and the sides of my nose.
With the round side, bounde the sponge gently over the concealor to blend it into the foundation.