Your best bet for advertising is to try and get your app picked up by one of the mac specific blogs. TUAW, Mac Appstorm, Macworld, Macrumors etc. You should als

Your best bet for advertising is to try and get your app picked up by one of the mac specific blogs. TUAW, Mac Appstorm, Macworld, Macrumors etc. You should also try and buy ads on those sites to specifically target your userbase. If you can get enough traction through there it's possible that you'll get featured in the App Store, or if not at least the mac users who read the blogs will spread the word to their friends and family if they like it.