Back in October I switched from a Windows(Linux Dual Boot) based Laptop to a MacBook Pro. Most of the software purchases have simply been to replace software that I had on the windows machine. The two notable exceptions to this were OmniOutliner Pro and OmniFocus. I scoffed a bit at the prices of both (although I did get reduced pricing on OmniFocus) but after taking the the time to learn them, I would spend the money again.