Whenever you have an imortant bid on the AH but can't get to the computer, bring out your mobile device and use the auction house app! You could log in via SK account and keep track of the current auctions, while also keeping track of things you could see from your inventory for items you may want to sell.
As for auction winning the app can give you a notification if you won your auction or not, then send you the mail either on or to your SK account for when you get back on!
This could be an extremely helpful app for people trying to bid on those awesome wings but having to let your little brother on!
As for steam users: the app could be a download from the steam app, just like any, or just a log in through steam like the SK website.