Even though she's the Barefoot Contessa on the dreaded Food Network, I really like Ina Garten's recipe for lemon pound cake. It doesn't have poppyseed, but that's something you could easily add to the batter. It's very lemony- you add zest to the batter and after it's done baking you pour a lemon syrup over the loaf, which soaks in. And if that's not enough, you can glaze the cake with a lemon icing. The recipe below makes two loaves, one of which can be frozen (sans icing). They travel well and are great for picnics, concerts at Millennium Park, etc.
http://www.foodnetwork.com/recipes/ina- ... index.html