So you are at the point where you are not wanting to write all of your own unique content everyday. You might have things to do. So you have heard of those sites like Guru.com or Elance.com and want to give them a try. All i got to say is good luck and be careful. There are a great number of people on these sites that you can deal with that do excellent jobs and stand up to their work. But then again there are a number of ones that are like that Steve Miller Song "take the money and run". The best thing to do is try to develop relationships with people that do some work for you and then try a couple different people. Use them for small stuff and see how they respond to your questions and how long it takes them.
Because a lot of them are in India it usually takes a day till they get back to you. Or if you are up at night real late you can usually get them then. I would suggest using them for some stuff but articles can be a subject that you might want to try a different country for. Malaysia is a good country for this. Because their first language is English and they actually studied better than I do'ed. So the articles actually come back in pretty good grammer and informative.
However the only thing that I would say that I don't like is sometimes the idioms they use are not what I would say. Which is fine for some of the stuff but when you develop a reputation people will begin to understand your writing style and know when you wrote something or had it outsourced.
It is little things too like in American English for a lot of words (I can't think of one right now) but I have seen them we use "z" as where the British use "s" instead. Little stuff like that not a big deal, but your regular readers will notice it.
So bottom line don't use the articles for your primary blog, keep that to yourself. You can publish for further dates. So sit down with a nice glass of tea and drill out 10 articles and then go stick your hands in some ice cause they will need it. And leave the places you are just trying to get the backlinks and such from to the outsourced.
