Just got a promo e-mail from news@morgan-motor.gtml1.com regarding the 3w at Goodwood. Too bad MMC Marketing can't spell.........
The correct form in "to whet your appetite".
"Whet" means to hone or to make more keen or stimulated, whereas "wet" means to cover or soak with water.
Read more: http://wiki.answers.com/Q/Is_it_'wet'_your_appetite_or_'whet'_your_appetite#ixzz1QD0AD0ZS