In addition to Henderson, there are nine other first time candidates on the ballot: David Cone, Jesse Orosco, Dan Plesac, Mo Vaughn, Greg Vaughn, Mark Grace, Matt Williams, Jay Bell, and Ron Gant.
There are 13 holdovers including Tim Raines, Bert Blyleven, Mark McGwire, Jim Rice, and Tommy John. Rice and John are in their last years of eligibility.
To be inducted, a player must receive 75% of the votes. There are about 575 eligible voters (the exact number won't be known until all the ballots are in). Ballots are due by December 31. The results will be announced on January 12, 2009.
The Veterans Commitee will anounce its selction on December 8.
(For the record, the BBWAA ballot is smallest in terms of the number of candidates. I assume the piece of paper it comes on is about the same size as it always is.)