For eg. I know that atm iOS developers based in San Francisco or the valley can charge out around $1500 per day.
I also know that on-site web development work in Australia (Sydney) can fetch $150+
These are both from friends of mine who are experienced developers and who can work and complete a project on their own.
I also learnt today that the discount on working remotely can be large in some instances. (30%)
Interesting takeaways to get from other HN members would be what areas are hot at the moment (for eg. javascript web app dev), where the market is hot, how clients are being found, etc.
I am getting back into the market after a few years of fulltime employment and taking time off, so I am trying to get as much information as possible in order to get back up to speed.