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I forgot earlier that the Standard edition of OmniGraffle doesn't support arbitrary document scales, so for something like a room layout, you'll need to manage scaling yourself. ("Ok this table is 2 ft x 3 ft, I'll draw that as 2 inches x 3 inches.")

The Pro version handles arbitrary scales, so you can tell it that 1 inch = 1 foot or whatever, then add a 2 ft x 3 ft table and it'll draw as 2 inches x 3 inches (or whatever is appropriate).

I edited my earlier post to clarify that point, but wanted to add a new post for the benefit of anyone who has already read my earlier post. My apologies for the confusion.