You can substitute Meyer lemons for regular lemons in just about any recipe to add a subtle twist. Remember, though, that Meyers are going to be sweeter, so you'll want to cut the sugar down just a bit if you're making a dessert.
I picked up a bunch of Meyer lemons because I think they're awesome, even though I only needed one to make the rice pudding to get the photos up on
my web site. I decided to use one of them to make lemon squares. I remember lemon squares from just about every potluck I ever attended when I was a kid -- probably because they are extremely easy to make, and yet look appealing and elegant. The top layer forms a crust that looks a little like creme brulee, at least to me. Using the Meyer lemon added an intensity of flavor that lead my hubby to declare these the best lemon squares he's ever had.

Meyer Lemon Squares
1 c. flour
1/4 c. powdered sugar
1/2 c. melted butter
1 c. sugar
1/2 tsp. baking powder
2 eggs
zest of on Meyer lemon
2 tbsp. strained Meyer lemon juice

Preheat oven to 350 degrees. Grease an 9"x11" pan. Combine the flour, powdered sugar and melted butter, adding a little flour if necessary, to create a cohesive dough. Turn this out into the greased pan, and press down into the bottom.

Bake the crust in the preheated oven for 20 minutes. Meanwhile, combine remaining ingredients, stirring well just before pouring over baked crust.

Return to oven and bake an additional 25 minutes, or until the top has formed a solid golden crust.

Allow to cool for 15 minutes, then chill for at least one hour. Cut into squares and serve.