Build your app with Corona. Don’t forget all the required resources, such as Default.png, Icon.png, etc.
Store the resulting file in a Payload folder, then compress the Payload folder.
The resulting zip file is identical to the final IPA you’ll be sending up, and the file size of the zip file is what iTunes will be determining if it’s too big for 3G downloads.
I’m at 18MB and packed to the gills with Facebook and OpenFeint, etc. [import]uid: 6084 topic_id: 7038 reply_id: 24655[/import]