Do it yourself!
Get yourself a flap wheel or something and work up the rod, not across it.
Thats what most places do, you want the casting seams (flash) ground flat with the rest then get the rest of the surface to match. Then get it shot peened.
Dressing the block etc is the same.
You want to get rid of stress risers and sharp corners. This is where things split.
Shot peening just bombards the surface with ball bearings basically, the metal swells as well btw. Its a surface hardening treatment. It doesn't actually increase the materials over all strenght (you can't unless you change its make up by adding other things).
The pic that Observer posted shows a nicely done rod (doesn't look shot peened though), you can achieve that without to much hassle and it will be stronger than a normal rod.
Rods take a lot of battering in an engine, they go through cycles of tensile (stretch basically) and compression. The hardest time on a rod is on the exhaust cycle and when the timings over advanced.
Rods see pressures of several tons thats why they let go. High revs basically seal their fate. The loadings increase with speed you see.
It takes some serious power to bend a rod from power alone.
Chris