One 'trick' that has worked for very well for me on several occasions is to offer a fixed price rather than an hourly rate. This does however require that the job has very clear deliverables and the you have a very good feel for how much work the job actually is. It's especially helpful if you've already done something very similar in the past and already solved all the hard problems once.
In my experience many clients prefer knowing up front how much a job will cost rather than having to worry about arguing about hours as a project drags on. I've managed to essentially get double and triple my normal hourly rate this way, while the client still walked away feeling like he got a very good deal.
In my experience many clients prefer knowing up front how much a job will cost rather than having to worry about arguing about hours as a project drags on. I've managed to essentially get double and triple my normal hourly rate this way, while the client still walked away feeling like he got a very good deal.