If you haven't found what you are looking for here, you might look at the Firearms Talk Forum on XD. http://www.firearmstalk.com/forums/f59/ I'm sure there are other XD links that could be helpful. If you have other good sites, post links to make it easier for folks to find alternative information.
XD talk is another good forum. I dont post there much, but I have bought a fair amount of gear on there. http://www.xdtalk.com/forums/ JB