Continental hired a total of 58 Pilots in March 2006. As far as I can see, 15 went to the 757 and the remainder were assigned the 737. All new hire pilots were based in EWR. I have been told that it takes about 3 months to advance to IAH on the 737 and a bit longer to get CLE.
Most junior line holder on the 737 F/O EWR is an October 2005 hire.
This rate of hiring is expected to continue.