In a large bowl, beat the cream cheese, confectioners sugar, vanilla and lemon peel until fluffy. Fold in the whipped cream. Divide among 12 dessert dishes. Cover and refrigerate at least 2 hours.
Meanwhile, combine cracker crumbs and sugar in a small bowl; add butter and mix well. Press to a 1/4-in thickness on an ungreased baking sheet. Bake at 375 degrees Fahrenheit for 10-12 minutes until light golden brown. Cool completely.
Just before serving, crumble graham cracker mixture; sprinkle over mousse. If desired, top with fresh strawberries.