Matthew Soldo,
Along Tom Mizukami's suggestion of using SVG, you may want to consider webCGM ( http://www.cgmopen.org/ ). Its deployment is more limited than SVG at this point. Still, it might have some additional benefits in your application, since the graphics are vector based.
"The CGM Standard CGM is a format defined by the International standard ISO/IEC 8632:1999 for digitally describing vector, raster, and hybrid (raster and vector) graphic pictures very compactly. It has proven to be a very good format for the technical illustrations in electronic documentation, geophysical data visualization, and other demanding 2-dimensional graphics presentation applications" ( http://www.cgmopen.org/technical/cgm_standard.html )
So the burden of porting some industry graphics could be made easier with this approach.
I don't have any experience with it yet, but am planning on an implementation that will likely be using it (or SVG) sometime this summer.
