It is being suggested that Jakob Nielsen might be influenced by work with Macromedia in his views on PDF.
I don't think this is in any way true. Jakob Nielsen is just wrong, that's all. His views on PDF are longstanding and consistent with his other views, in general that it is better tyo use the oldest technology available and to assume the users know nothing and and are not prepared to learn. Also text in itself is probably all that is really needed so graphics could be avaoided as they may cause problems.
Jakob Nielsen has stated that PDF is ok, for content to be printed out.
Meanwhile if Macromedia will support PDF that is to be encouraged. They may get a PDF 'ankle biter' by mistake with eHelp but let's hope they continue it.