I have returned from active duty! Whoa, this thread is STILL going? Wow.
First off, pdf2html will never do graphics well for iSilo because it converts all the graphics into a merged background picture with text placed over it. iSilo will either ignore the background, or separate the text from the graphics. Adobe Acrobat is much more intelligent (get what you pay for, I guess).
It's good to be back. Got iSilo 4.1 loaded on my shiny new Tungsten|C! How may I be of service?