I'm writing this post just to give more information about my latest topic titled "Flash Catalyst limits the import of files bigger than 15 MB".
Thanks to Terry Hemphill of Adobe, I discovered that the 15MB was a limitation of Flash Catalyst Beta 2, not the final version.
Reading this piece of information from the Adobe Flash Catalyst Technote I've learned there's a table that you can refer to ensure you are adhering to the limits on imported art files:
Maximum bitmap image size: 2048px x 2048px
Maximum total allowed pixel count: 20 million pixels
Maximum total allowed object count: 6500 objects
Maximum file size: 40MB