First, MaxMiles just released a new version of its software which includes the ability to download your frequent flyer accounts. More importantly, MaxMiles is launching a comprehensive online mileage management service, MileageMiner(tm) later this week. Not only is your account information updated daily, but it includes some pretty neat functionality such as checks for missing flights and a customized list of mileage offers tailored to your programs and status level.
I'd be interested in getting feedback if/when you take a look at it.