Just got 1lb of amarillo hops in the mail. Gonna make some of Ed's Haus Pale Ale. Got a great deal on the amarillos and I heard amarillo and cascade are very similar/related.
I think amarillo is a lot more citrusy than cascade. Together they are an awesome combination... makes for a great in your face American style pale ale.
I took a keg of my Amarillo pale ale to a party yesterday and it was gone in under an hour. Everyone was asking if I put oranges in it. That was my first time using it as an aroma hop but I can say I wish I had a pound of it sitting around! Really anything that you want an american hop character it will be great with amarillo.