Thanks to all for the great comments and ideas. I especially appreciate 
Roger's low-vision perspective (I'm beginning to belong to that club, as 
well), his development guidelines (70 - 150%) and the info on "zoom".
  My judgements regarding which technique to use to scale images to 
text-size would depend on the audience, layout requirements, how large a 
site, etc. If the images degrade too much by using the em method to resize 
them according to text size, and the site is too large to spend the time and 
resources creating different image versions, I think using a php-driven 
graphics program to create images on the fly sounds interesting. I don't 
think I'd want to resort to Flash, if the images are critical to navigation, 
because of accessibility issues (hope I'm not opening a can of worms with 
that comment). A non-flash site would most likely have to be created anyway.
  If the site is small enough to make it practical, I think a good solution 
for today is to create links to small, medium or large font and image style 
sheets, if the audience warrants.
  Scaling the image text headers so that they look okay with reasonably 
large or small text without allowing the browser to resize and distort them 
would require the least amount of hassle--simplicity is often the best 
solution. For the background-image, I think using a regular image along with 
z-index to place it behind the text and using the em method to resize it 
along with the text-size might work if the image doesn't have too much 
detail (say a ghosted one) and doesn't degrade too much when 
browser-resized.
  As for using SVG's in the future--I can't wait!!!
  Thanks again, Janie
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