Rinse shrimp and pat dry. Preheat oven to 450. Lightly oil a rack large enough to hold shrimp in a single layer. Put rack on a baking sheet and set aside. In a medium sized bowl whisk together the flour, egg white, and beer with 1/4 ts of the salt until smooth and creamy. In another bowl combine the breadcrumbs, pecans and remaning salt. Dip shrimp into the crumb mixture and then into batter, turning to coat well. Dip again into crumb mixture, truning with a spoon to coat evenly. Set shrimp on prepared rack so they do not touch. Bake for 12-15 minutes or until golden brown on the outisde and opaque in the center.Serve immediately with lemon wedges.