Skybus.com is a fairly new Airline based out of Cleveland OH. The offered flights from Cleveland to select cities in the US for as little as $10 for the first ten seat (on select flights). They are able to offer such low rates because they charge for any extra things you need -- checking luggage, blanket, pillow, snacks, priority seating. If you are someone who just takes carry-ons and don't need all the extras then you can really make out. They have recently started to base flight out of Greensboro as well. I have had some good things and bad things in my experience with this airline.
I was able to fly my parents round trip from Los Angeles (Burbank, CA) to Greensboro, NC for under $400. I did not experience any issues when I booked their flight.
I recently purchased tickets for my family of 4 to fly the opposite way to visit them in June. We had to fly seperately because the kids and I are heading out for two weeks and Steve could only take off for one. After I bought the tickets ($120 going out, $120 coming back) for a total of $256.50 each, I went back to buy Steve's ticket and noticed that the day going out for me and the kids was now saying $100. That means that they over-charged by $20 each. When I bought Steve's ticket it was ($100 out and $120 bac) which should have totaled $220, but was totaling $240.
So all in all, it seems like I paid $80 too much. Even with that overcharge I still was way under any prices that were being offered through any other airline. I have emailed their customer service, because they do not have a phone line (one of the ways they are able to save money) so we will have to see what happens about getting a refund.