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The opencv cheat sheet came to the rescue. link text

it appears saving a Rect is easy, but loading it requires a few more steps:

FileNode mr = fs["myRest"];
Rect r; 

r.x = (int)mr[0];
r.y = (int)mr[1];
r.width = (int)mr[2];
r.height = (int)mr[3];

so good enough :)