iPadpalooza is in full swing. If you're like a lot of devs, you're quickly moving through (if not past) your 50 promo code limit per application version. If marketing now is important to you, don't forget that you can gift applications through iTunes. After all is said and done, this will cost you 30% of the price. Apple will return 70% of the cost back to you at the end of the month because you are basically buying from yourself while making sure that Apple gets its cut.
Gifting applications offers a reasonably cost effective way to expand your marketing beyond complimentary promo codes. Keep this option in mind as the iPad App Store gold rush gets underway.