I'm not sure if people here are aware of the efforts to get Sensory Processing Disorder as it's own diagnosis in the upcoming 2013 edition of the DSM-5. You can read about the efforts here:
http://www.spdfoundation.net/dsmv.html

The APA allowed public comment back in March and April and will apparently do so again in 2011. You can sign up to add your comments about SPD (and other proposed changes to the manual). The SPD Foundation will provide a link when the comments page on the APA website is open. Comments from parents and professionals can help to get SPD recognized as a separate disorder which would open doors for further research, treatment options and just increase awareness and understanding. You can join the effort, stay updated and add comments when the time comes!