Dan Tokaji, whose excellent “Equal Vote blog” just had its first birthday, writes How Did Ohio’s Voting Equipment Fare in 2004?” A snippet:

Overall, the residual vote rate in Ohio ‘s November 2004 presidential election was 1.65%. That’s down slightly from the November 2000 election, in which the residual vote rate was 1.89%.
The table also indicates the type of system that each county uses for in-precinct voting. In 2004, the counties that used each of the three types of equipment for in-precinct voting had the following residual vote rates:
Type of Voting Equipment Residual Vote Rate
Punch Card 1.84%
Electronic 1.25%
Optical Scan 1.01%