The sl2h program that comes with noweb is a terrible hack (I would not wish this to my worst enemy), but you can handle it. I used it to prepare handouts for my classes. If you find yourself in an extreme situation, you can use terrible tricks like this:
\ifhtml \begin{center} \includegraphics{address.png} \end{center} \else \begin{center} \includegraphics[scale=0.5]{address.eps} \end{center} \fi
(As you probably can say, I do not use pdflatex, I use simple latex.) But hacks like this work, and the numbers are included. I think they should all be PNG or JPEG; I'm sure sl2h doesn't know how to convert a PDF shape to an image for a web page.)
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