One thing I was remiss in not mentioning: for it to work properly (and for your iframes to be search engine friendly) you have to add an extra clause to your code. For example:
<iframe src ="FrameStuff.html" width="900" height="1000" align="center">
<p>Your browser does not support iframes. Please click <a href="FrameStuff.html">here</a> to see the content.</p>
The stuff in the paragraph is visible not only to browsers that can't support frames (like mobiles), but search engines (and SiteMapper) can see it clearly. If the content is something that they're not going to be able to see anyway, like a Flash animation, then use the text as an opportunity to describe what the content would have been if they could have seen it. Think of it as an "alt" tag on steroids. In my case the content is dynamic stuff that will be generated and uploaded by another program on a regular basis, but I wanted it to be displayed in the context (and using the style) of my VSD-generated pages.
Hope that's useful to someone.
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