Alpha Channel Saving /w Photoshop CS

I am haing an issue with not being able to save alpha channel information with Photoshop CS. I know there is a tool out there called SuperPNG, but the newer version of that has the same problem. The transparenies save fine with PNGs, but the alpha information does not. Can someone point me to a plugin or a new PNG.8bf file format reader for photoshop which will allow me to save/load this alpha channel information?

I have heard the "old" version of SuperPNG can do this fine, but I cant find it for download anywhere.

Thanks :)