Details can be found here.
Greg and Maya's home and nearly all of their possessions were destroyed in the fire. Faeryn has a list of simple things that would be helpful now in the above site.
I know many of my friends list are local to Virginia and like me probably knew Glenn at least in passing from various cons, if you have a few minutes this coming weekend, please see if you can do anything to help out. If you can't, find someone close to you and tell them how much they mean to you. We're not around long enough to let it go unsaid.