wsucougarchick05 and SouthsideJAX: Whether the bartender puts lemon or orange into a glass should have more to do with the style of beer than the region of the world. And you're talking about two different kinds of beer.

Coors' Blue Moon is a Belgian-style witbier and, while wheat is among the grains used to brew a witbier, at least half of the malt should be barley. Witbiers are typically spiced with such things as coriander and curacao orange peel. That's why the orange goes into the glass, although Blue Moon's creators admit it was first done in a Denver bar for show, not to change the flavor of the beer.

The wheat beers made in the Pacific NW are more often than not German-style hefeweizens such as Widmer Hefeweizen from Portland, Ore. Many people in the U.S. put a wedge of lemon into their hefeweizen, but that's not common in Germany.

Whether it's an orange in a witbier or a lemon in a weiss, the acidity of either orange or lemon juice has a deleterious impact on a beer's head retention so a lot of purists (spelled b-e-e-r--g-e-e-k-s) don't use them. Personally I prefer the taste of a wit or a weiss without the fruit. Of course, it's a subjective decision and you should do whichever you enjoy most.