This is going to be a simple post, since I really don’t know a whole lot about being an Audio Transcriber.  I do know that if you can type and spell well you can make a decent amount of money doing this.  Basically you will just be transcribing interviews and speeches and you get paid by doing each job.  There are a couple sites where you can get hired doing this. 
These two sites are meant for people with really good typing and spelling skills.  The first is tigerfish.com, and the other one is productiontranscripts.com.  Both of these sites will be quite strict compared to contractedwork.com, but you have a better chance of making more money with them.  Since I don’t have experience with this work there isn’t much more I can say, but it might be worth a try if you’re interested.