I blogged about Stefan Hafenege before, he has developed a new version of his free tethering program. It’s specific to Mac and to particular Nikon DSLR models, but if that’s your combination then it looks like a great solution.
Read his description of the new version which is called Sofortbild on his blog, and download it from the Sofortbild Website.
Once again, well done to Stefan!
Amazing DIY solution to wireless thethering is described here, with much discussion here.
Particularly interesting is that this is doing standard USB so it matters not what type of camera, software, computer etc you are using.