Hack 2 Work is a series of tips and tricks for designers from Core77. Looks good so far. Check out Liz Danzico's How to Learn About Your Clients From Their Table Manners (to be taken with a grain of salt, I'm sure):
When the food arrives, does your client salt and pepper the food before he or she tastes it? If so, this is a clear sign that your client is potentially closed-minded, not open to new ideas, or set in his or her ways. If your client first tastes the food, and then adds salt or pepper, tremendous. This suggests your client has opinions, and is not afraid to exercise them-but only after the voice of the "creator" (in this case the chef) has been fairly given a chance first.
and How to Make Your Client's Logo Bigger Without Making Their Logo Bigger from Michael Bierut:
Like all con games, this one is based on the illusion that the sucker has the advantage. In this case, it's the conviction that this kind of client always has that it's your job to do as they say. Little do they realize that your final allegiance is not to them, but to the quality of the work, something that you cannot in good conscience permit them to jeopardize with their lack of taste.
Update: James Grimmelmann shares his similar tip for lighting designers:
The lighting-designer version of this is to tell the director that yes, you can make the lights brighter, but you'll need to turn off the power for a few minutes while you change some of the wiring. Turn everything off, wait fifteen minutes while the director's eyes adjust to the dark, then turn everything back on. It sure does look brighter now, doesn't it?