http://www.nascar.com/races/cup/2007/1/data/entry_list.html
For other races, change the race number from 1 to whatever week it is in the season.
http://www.nascar.com/races/cup/2007/1/data/qual_order.html
http://www.nascar.com/races/cup/2007/1/data/lineup.html
http://www.nascar.com/races/cup/2007/1/data/practice1_speeds.html
http://www.nascar.com/races/cup/2007/1/data/practice2_speeds.html
http://www.nascar.com/races/cup/2007/1/data/practice3_speeds.html
http://www.nascar.com/races/cup/2007/1/data/results_unofficial.html
http://www.nascar.com/races/cup/2007/1/data/results_official.html
For other series, change 'cup' to 'bg' for Busch or 'cts' for Trucks.
For Daytona, there are more than 3 practices, so just keep increasing the Practice Number.