User friendly way to schedule jobs in Mac OS X

You can schedule jobs via iCal. Create an event. Edit the event, and you'll see "Run Script" and "Open File" as options as alarms.

Well, there's CronniX, Maintidget, Macaroni and MacJanitor.

Have you tried using one of the launchd instead of cron? Apparently, Apple doesn't use cron anymore.

• Lingon (abandoned, but supposedly works on Leopard and Snow Leopard)
• Launchd Editor
• launchctl

Lingon is a GUI for creating and working with launchd. It's no longer being worked on, but works well for creating and editing Launch Agents and if you are on Leopard or Snow Leopard it's the suggested method over cron.