You can download the ado-files, do-files, and datasets for The Workflow of Data Analysis Using Stata from within Stata. There are two Workflow packages for Stata 10 (wf10-part1 and wf10-part2) and two for Stata 9 (wf09-part1 and wf09-part2). The package wf-help installs help files summarizing the workflow presented in the book. To find and install the packages, type
. findit workflow
Then choose the the packages you need, and follow the instructions.