Well, there's actually one to calculate mileage right close to home. We've got a beta for you to all use for now. Called MileMarker, it's the first stage to a very cool calculator. Click on over to http://www.webflyer.com/milemarker/milemarker.htm

Now. I say this is first edition because we are adding over the next week or two, multiple airports so that you can really configure trips through hubs (unlike Continental's, we feature all airports, not just a particular airline) and we are going to configure it so that based on which elite program you select in the interface, we'll show you actual miles plus your elite bonus miles and a total of them all. Also, it will eventually show you minimal miles based on airline selection.... So, please remember, this is just the start, we've got more goodies planned....