Proper way to down shift?

ProfessorDave

The conditions under which you would downshift include the following:
You want to accelerate
You want to decelerate
Your RPMs have dropped and you are going to "lug" the engine (say, trying to get power from the engine at or under 2k rpms)
You want to impress that cute girl over there (just be prepared...she won't be impressed. She'll think you are a loud, annoying idiot who doesn't know a think about what women want. She'll tell you this if you are moving slowly enough and your window is down).

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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT