JJT and Bird,
Ok, I appreciate the input.  When I first looked at my tiller I thought the tines were blunt and just L shaped metal with no edge at all.  Looking closer, I saw there was a nice fairly sharp cutting edge ground on the leading edges.  It amazes me how fast grass can dull steel mower blades, so I just supposed that dirt would dull till tines pretty quick, too.  I don't especially look forward to sharpening all those tines, but just thought I would ask if that was something I should consider as they wear.  I know Bird tills all the time, and anybody with 40 acres under their belt has a world of experience over me.  Thanks guys.
OkieG