First of all, yay for you on adopting a special needs doggie People never realize how special these little guys are. I have such a soft spot in my heart for the "underdogs".

Do you know if the blind dog gets along with other dogs or is it an unknown history? You're going to probably want to take extreme precautions when introducing them and settling the new guy in. Not because I think it will go terribly wrong, but his handicap may add some extra stress so a slow, calm transition would work best. I wouldn't leave the dogs alone unsupervised for at least a month. You probably will want to crate train the blind dog for several months anyway so he doesn't hurt himself while you're not home. I imagine he'd be fine after he knows the layout of your house well though.

This link lists some other links that may be helpful:

http://www.blinddogs.com/support.htm