Below are some resources to help you in your quest to find a job scheduler. 

Articles 

GOTCHA! Deploying Job-Scheduling Software

Automate Business Processes - Job Scheduling Solutions Grow Up

Job Scheduling Utilities

Job Scheduling Buyers Guide from 2001 (Still Relevent although pricing has changed)

History and Definitions of Job Scheduling

Job Scheduler in Wikipedia

Educational Links

What is cronjobs and how to use it?

UNIX Basics - Job Scheduling

Crontab - Quick Reference Guide

Excellent Course on Writing Batch Files

Batch File Commands