Via The Mess That Greenspan Made [1] comes a link to an interesting site noting the intrinsic metalic value of US (United States) coins [2]. Now, I have old quarter [3] (mostly silver) that's now worth quite a bit of money [4], but it's more than I expected.
In doing some research, I realized I got the actual weights wrong back when I first calculated its worth.
Well then.
But, with pre-1982 pennies worth twice their value in copper alone, perhaps it's time to go through my penny collection …
[1] http://themessthatgreenspanmade.blogspot.com/2006/11/whos-minding-mint.html