Here is a database with all the baseball players who have gone through the Modesto minor-league system and into the majors. Use the dropdown menu to select a team, then hit "Search" to find out what player went from Modesto into the majors. You can also search by year they were in Modesto or year they were in the majors.
To return to the "Search" page, hit the back button in your browser.
In his blog on The Hive, The Bee's Brian VanderBeek writes more about it.