On my '01 (5600 miles) I get a blue puff on start every once in a while, but fairly infrequently. It seems quite random, actually - I haven't noticed any pattern like first thing in the morning, parked on a hill, warm start, etc.
Some smoke on start up seems normal - it is reportedly a result of the Boxster's engine design. So long as you only see it on starting then you're likely OK. Unless you're seeing a significant change in oil level, I'd not worry.
Porsche specifically mentions that some oil consumption is normal in the owner's manual (on page 134 in my 2001 version) - likely as a result of the same concern you're probably feeling. They mention several variables that can affect oil consumption, including quality of the oil, viscosity, climate, etc.
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