Where's the poll..!
I always used to leave mine in gear, it's much safer than just relying on the handbrake, also if I was parked for a while I probably wouldn't use the handbrake as it used to seize.
After reading somewhere that putting the clutch in to start takes some strain off the starter I've always clutched in before starting, and usually checked it's in neutral or know which gear it's in!
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Cars...
'93 Audi Coupe 2.0 Alpine White (sold)
'99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold)
'00 Audi S8 Agate Grey (Sold

)
'11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ)