I like Award Wallet a lot for keeping track of miles and expiration. I think them not having an app for mobile devices, like the iphone, is a big disadvantage for them and their customers and is my only major squabble with them. Often times when i am travellling or on vacation i don't take a laptop with me, and don't particularly enjoy hopping in internet cafes all that often. So, it would be great to check balances on a smartphone.