Okay, I worked out a source for a more-or-less live silver spot price. Which means I was able to finish my Perl script for getting the BTC/Ag ratio with the press of a button.
Right now the script is posting data to
https://twitter.com/HollowTreexds every 20 minutes. The formatting might be a little rough, though.
I can output this data in all kinds of ways, comma delimited, whatever. If anyone has any use for it, let me know.
I aim to have this thing plotting a graph at some point. Time will tell.