In the Actions Palate in P

In the Actions Palate in Photoshop, there is a folder labled “Video Actions.” The first action in that folder should be called “Alpha Channel from Visable Layers.” Apply that action.

Then save your graphic as a tiff. Make sure you DONT check the “savetransparency” checkbox in the dialogue box. This will confuse photoshop.

Then you should have a file with a perfect alpha channel. At least, this is what I do with FCP.