I've made an off-line version of the tutorial available on the downloads page as a zip archive (1.4MB).
For the sake of the many GLScene users out there, I've added a HTF file writer to my to-do list. My Delphi→C++ translation abilities are yet to be tested, however, so this may take a little while.
In case I don't touch the website again within the next ten days, which is quite likely, I wish you all a very merry festive season. May your grievances be aired, your aluminium poles be unadorned, and your feats of strength be mighty indeed (What the...?).