I had problems connecting to MtRed months ago, so I switched to BitParking (from reading another redditor's comment in /r/mtred).  The site was up just last night, I believe.

I was hoping to use an extra computer to mine there, and I have been trying to reinstall Windows on an old laptop for this purpose -- I can't Linux well, and when I tried Mint and Diablo Miner, I got some message saying that OpenCL wasn't installed or something, even after following the directions from Google.