I use LibreOffice Impress with the “presenter console” module. Impress it’s not the best presenter tool, of course, but it fits quite well the Presentation Zen’s approch. The only problem is that if you have a big presentation and you export it in PDF you get poor quality images, due a bug. In this case I export it in pieces of 20 slides per file and then I cut and create the final PDF with the command line tool “pdftk”.
Btw, it’s not about the tools ;)