png2swf is a client- or server-side component for converting PNG images (including transparent PNGs) to Flash SWF 5 and higher. version 1.0 crashed on some PNGs, the issue should be fixed now in version 1.1!

we can offer two versions of png2swf:
windows COM object (for use with ASP or HTA, VB, C++, Delphi, etc ...)
the com object can be included in any (!) other program, as well as you may access it directly from ASP!

windows command line tool
you can use it like "png2swf pic.png mymovie.swf". of course you may also use it for batch processing using a simple batch file!

Includes both command line utility and an easy to use DropScript useful for batch converting PNG images to SWF movies. Useful when building dynamic flash 4+ websites that need to load high quality images, or images that need transparency.Note that Flash MX does support loading JPGs dynamically, but not PNGs, hence the need for a utility such as this.