It would appear that LensWork Extended PDFs are NOT compatible with the iPad, as of the latest issue 87, when they started using Acrobat 9 features. These files show up with an "unknown file format" message and a little picture of an alien!
The individual PDF files from issue 86 are compatible. I was able to get the iPad to recognize some of the multiple-file hierarchy by zipping the files up and moving the zip file into the app GoodReader on the iPad (using iTunes to do the moving). However, if I tried to move the entire issue onto the iPad this way, it failed. I was able to move an entire issue into GoodReader using GoodReader's wifi server, but that was a lot slower (30 minutes).
The standalone audio files are no problem, MP3 is supported. Links to them from the PDF, however, don't seem to work.
I agree, LensWork Extended would be very cool on the iPad. Maybe Brooks can be convinced to support it, somehow.