Where to get MinGW for Qt 4.6

For anyone who wants to use the non-SDK version of Qt for Windows, and have found that it no longer downloads the required version of MinGW:

You need to get the MinGW 4.4 zip file, available on the ftp.trolltech.com site. It's usual to install it in the root directory, but you may find it convenient to unpack the archive somewhere else (e.g. in your Downloads folder), rename the "mingw" directory, and then copy that to root, just in case you need to keep the old version around for older versions of Qt for other libraries. When you install Qt, you then tell the installer where MinGW is, so that (among other things) when you open up a Qt command prompt, it will know where to find gcc, make etc.