I'm sure I've seen a wwebsite on here where you can record and keep track of your trips calculating the miles you fly however I've searched and haven't been able to locate.
I use the BA97 calendar (see signature) which apart from tracking ur miles/sectors, has a nifty calendar function which allows you to put up ur upcoming flights/lounge visits and schedule meetings with other people (mainly FTers) if they're on the same flight or in the same lounge at the same time as you are.
From just $6 we'll remove all advertisements so that you can enjoy a cleaner and uninterupted viewing experience.And you'll be supporting us so that we can continue to provide this valuable resource :)