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Is the head angle on a full suspension mountain bike measured with our without sag? I would imagine that the rear shock sagging would give a slacker head angle than what is measured without sag.

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No coffee yet, but some scribbling suggests to me that it shouldn't matter much, if at all. Either both front and back will be sagged or neither will be. Also, there's not likely to be any consistency across manufacturers. –  alex May 12 at 3:14

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Generally they are measured unsagged. Usually, as @alex said, it doesn't matter, since they are full suspension bikes, but some setup (e.g setup for super steep races) where you want your rear end softer, it would matter.

Some hardcore hardtails (e.g the blue pig of http://www.ragleybikes.com/) measure the head angle in a sagged situation. Because they are hardtails they only nose dive under the rider's weight.

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BTR Fabrications product some long-travel hardtails for DH, 4X and Enduro. They have a blog entry about headangles and sag in long-travel designs: btr-fabrications.com/2012/08/30/sixty-one-degrees –  Emyr May 12 at 12:10

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