Exposure blending tutorial

http://layersmagazine.com/exposure-blending-in-photoshop.html
http://photodoto.com/exposure-blending-tutorial/
http://photo.tutsplus.com/tutorials/post-processing/an-introduction-to-exposure-blending-with-raw/
http://www.nickgallery.com/web_pages/technical%2013.htm
http://www.kirainet.com/fotografia/exposure-blending-o-hdr/