I'm using the font replacement technique, Cufon, on a site I am building. We also have forms from form assembly, provided by my client. A very strange thing happens where, on the page where we use form assembly, cufon doesn't work. I have narrowed down the problem to the css files, of all things. When I include ANY of the formassembly css files, the font replacement breaks. If I remove them all, the font replacement works. I can link other css files, no problem, but not the form assembly ones.
Just a note to let you know we'll take a look and see if we can suggest anything. Perhaps if this is a popular product someone else in your situation can chime in.