We have generally done a web based system so that we can do multiple inputs while simultaneously having the field team access the data. It really helps when we can put up a wi-fi network (yeah, yeah, 2009) so that we don't hae to run between the stands and the pit. It also allows us to share the data easily with anyone interested.
You can check it out at
http://gearheadcrossing.org/2008/