I started working at my current position nearly 6 months ago, and am paid per-hour, per-project at a flat rate. It was originally going to be a 3-month contract-to-hire, but the company lost a major client and was not at the financial place to make me an offer after the three months had ended.
It has since become a contract-to-hire with an undefined length of time. I have learned a lot of new skills during the last 6 months, and feel my pay rate could potentially increase. At what point in time, or in learned skills, is it considered ok to ask for a pay increase.