Hello, all--
After purchasing the FontSite 500 CD, I wanted to make good use of some of the nice text fonts it contains--in particular I wanted to create TeX virtual fonts that would add ff, ffi, and ffl ligatures and replace the ugly ( ;-) ) lining numerals with old-style figures.
After considerable effort I figured out how to edit the VPL files for the desired effect. I also wrote a Python script to automate the process, though it may well not work for anyone else. Anyway, since I have found very little documentation on virtual fonts, I thought others might benefit from my experience, so I wrote up the procedure and posted in the (new) TeX Tips section of my Web site.
So, if anyone is interested in this subject, have a look at
http://havenrock.com/textips/bookfonts.html
Please let me know if you find any errors or points that need to be clarified.