I have been playing around with alternate tuning techniques recently. I have been learning a Robert Johnson song "Kind Hearted Woman Blues." He tunes his guitar to Eb=Bb=Gb=Db=Ab=Eb, basically half step down.

My main guitar is tuned to standard tuning. I was wonder if there is an ill effect of frequently changing the tune on your guitar (my bet is probably not)? My older guitar I did tune it down a half step.