For those who wonder what lens to buy next etc. this software is for you, it looks through your specified folder/folders and then looks at the EXIF to determine which focal length, shutter speed, aperture, ISO you normally shoot at and then plots graphs. Useful for looking at what your needs are, so just wanted to share this neat software with you people.
http://www.cpr.demon.nl/prog_plotf.html
http://www.cpr.demon.nl/prog_plotf.html