#1 get a nice 40gb hdd at least... preferably something in the range of 120gb or higher though
#2 get it built
#3 try getting some dvd burners that are like sata... or have larger buffers. that would be nice.
#4 make sure you have plenty of ram, the more ram the better when burning dvds and cds.
#5 get something like alcohol 120% or nero 7 ultra edition...
then, simply select "burn to multiple recorders"
i dont know of any freeware that will do this for you, but you could probably google it... or just buy the software i suggested!
with this setup you could probably burn about however many dvd burners you buy in a matter of 5-10 minutes
4 dvd burners = 4 dvds burned in less than 10 minutes (at 16x)