I don't think the microchip is the mark of the beast. Just as I did not believe credit cards, etc. was a mark of the beast.
I beleive the mark of the beast is a symbol of the condition of the heart that can not be seen except by God.
I don't know how to explain but I think the mark has to do with being greedy and being attatched to material things, and the mark on the right hand symbolizes the work that you do with your hand(s) to acquire worldly gain.
Would you accept a microchip implant? That is a tough question brought up by satan to cause fear to make it impossible to love God and your Nieghbors, and I would not like a foriegn object in my body, just as I don't like all the extra gagdets on cars that make for more things to go wrong, and I preffer to drive my old Chevy