Sean, you beat me to it.

That's a classic, and I love it, too. And Jay, yours is one of my top favorites as well: I remember singing that with a group the first time I ever climbed the Rockies.
I posted another favorite on my blog today; it was this one, better known as "When I Survey the Wondrous Cross:"
Crucifixion to the World by the Cross of Christ
When I survey the wondrous cross
On which the Prince of glory died,
My richest gain I count but loss,
And pour contempt on all my pride.
Forbid it, Lord, that I should boast,
Save in the death of Christ my God!
All the vain things that charm me most,
I sacrifice them to his blood.
See from his head, his hands, his feet,
Sorrow and love flow mingled down!
Did e'er such love and sorrow meet,
Or thorns compose so rich a crown!
[His dying crimson, like a robe,
Spreads o'er his body on the tree:
Then am I dead to all the globe,
And all the globe is dead to me.]
Were the whole realm of nature mine,
That were a present far too small;
Love so amazing, so divine,
Demands my soul, my life, my all.
--Isaac Watts
There's a wonderful link at the Christian Classics Ethereal Library that has extensive listing of the old hymns:
http://www.ccel.org/ccel/newton/olneyhymns.toc.html