Update September 27th, 2010:
As of today TotalFinder launched commercially. You may try the tool for free for 14 days. After the trial period you can buy a license for $15.
About four months ago I switched to a Mac after using a Windows machine for more than 15 years. I did this for a couple of reasons. The most important ones are the outstanding hardware and software for home studio recording that are available for the Mac and the fact that OS X is the only platform that can be used for app development for the iPhone, iPod and iPad, which I am putting a lot of effort in to learn. (More on that subject later in an other post.)
One thing I still find hard to get used to is the Finder application on OS X. Not that it is bad software, but because the folders are sorted alphabetically together with the files. This is a real pain in the ass since I am used to having the folders displayed first and the rest of the files below the folders in Explorer on Windows.