We bought a great little machine called
Handy Recorder that hooks up to our present sound system (from the 80s or earlier!) and it records the service as an mp3. It was about $300.
The file is saved on a little chip, I put the chip in my laptop, drag the file off and then open it with
Wavepad
Wavepad allows me to edit the file so I only get the sermon, save it as an 16 kbs mp3 and then it is ready for uploading to sermonaudio.com
Since the file is already an mp3, I also can burn the entire service or just the serrmon unto a CD.