FormFactors (ATX): http://www.formfactors.org/DeveloperResources.asp
SSI (EPS): http://www.ssiforum.org/specifications.aspx
WTX: http://www.casereview.org/wtx/

Iwill: http://www.iwill.net/supports/power...&SID=170&MID=26
PCguide: http://www.pcguide.com/ref/power/su...mparison-c.html