If I know the end use is going to be very big I shoot raw. If I remember to alter the settings and its for stock I use large jpeg plus raw. Just for fun shots are taken on jpeg.

I do need to buy more 2mb memory cards for  some longer flights this year because if I shoot raw/jpeg I can only fit about 100 images on a card.

Stock pics could be for a variety of end use and if its for a poster or even as happened last year a four by five foot display I know it needs the Raw file to start with.