commitment :: you are basically "on call" so this job works best for people with "simpler" lifestyles
skills :: you must have a commitment to the site, willingness to learn other jobs, available quite a bit,
what you would do :: if some one with a job is unable to do there job for a day or a couple of weeks, you will learn there job from them and basically take their place until they are able to do their job.
how to apply :: go to the substitutes application thread and describe 2 jobs in your own words.