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What is the app all about and what promotional methods did you use? I mean i am clear about the fat that you will surely have an amazing app, but I do want to know what promotional methods were implemented to get such a high boost in the sales?
I don't know whether you asking me or the thread owner. I can tell you that I excessively write to review blogs. In germany there is a big one "appgefahren.de" - If they write about your app, you'll get very high visibility. You can write to the AppTicker (german app) team a mail too, for getting featured in their app (its only free if your app is good enought).
The other thing I do is guerilla metatagging. That means I tag my apps with names of upcoming big events which are related with the content of my app, because the people seems like to think "Oh I see there a great thing in reallife - lets have a look whether there is an app for that (or an app that is kinda equal)". I dont wan't to tell you which tags that are exactly, but I can tell you that these events boosts me to #1 - #5 in my category on the the days this events takes place.