let's see, if anyone is still looking at this thread. I stumbled upon this while checking on answered postings.
1st: Can't pdf be saved as html? I think having done this. But it may have been with Acrobat Full version. It's not for the faint of purse. Advantage: text is html, images are saved separately.
2nd: One of the very good screenshot programs with a scrolling option is - apart from the incomparable screenshot captor - HyperSnap from hyperionics.com. Region with scrolling, windows with scrolling, text with scrolling, almost everything.
Give it a try, if you never heard about it.