Straps for MF
I use a Hassy and a Bronica GS-1, mostly hand-held so a good strap is a big part of my kit.
For the Hassy I use the Domke strap (whichever one has the rubber grippy things like the camera bag straps) and it works just fine but I wish it were a bit longer so I could have it over my neck and a shoulder and have the camera tucked under my coat in the winter.
For the GS-1 (aka, the Beast) I use an Upstrap. With that ubergrippy rubber pad, it doesn't go anywhere. It will however, over time, totally F up any soft wool jacket you're wearing if you carry it on your shoulder. And they're hard to find here in the Cities. We have to mailorder them. =(