Aside from the preachy tone, practical advice on iPhone marketing - send out a sexy rich HTML email the morning after your app is released to your targeted mailing list that tastefully showcases your brand new iPhone app with the all-important 'Available on the iPhone App Store' badge.
Not explicitly mentioned in the linked article is that the more gorgeous and non cookie-cutter your app's UI is, the better a chance it has of breaking through into the top charts. How else to differentiate your app from the standard UITableView/UITabBar drones out there? The best looking iPhone apps combine good looks with focused functionality.
Weightbot
Note: I've bought the MacHeist bundle before and I did recall getting the Voices launch email blast (and GMail search confirms) so I assume it was sent to Tap Tap Tap's (600k strong?!) mailing list only.