How To: Install OpenELEC on Raspberry Pi (XBMC) using Windows
What you will need is a assembled Raspberry Pi and the required SD card along with a few pieces of free software.
Update 7/2014: New versions of OpenELEC Pi use a much easier Windows method now: http://wiki.openelec.tv/index.php/Installing_OpenELEC_on_Raspberry_Pi#tab=Windows
I first learned of this method from another blog called TasksOfOhm which outlined the process as clear cut as possible. For my blog here I will be using the same method.
OpenELEC is my preferred distribution for stand alone XBMC. Windows users will need to follow a manually created SD card partitioning scheme which is outlined below.