Roger,
Thanks for this post about a simple quick release connection. I stumbled upon it today and found it useful for situations where I can count on the line maintaining tension and where an accidental disconnect is not a big deal. Here are two photos showing my implementation of your suggeestion:


Here's another photo with a bead added to the string. The bead makes the connection a bit more secure than with a knot alone. Of course one could make a bigger knot also but the bead is pretty easy and very light.

Here's a photo of multiple beads added to the string. This adds some adjustability to the quick realease set-up. The cord in the photo allows 3 adjustments, 2" apart from each other.

In the final photo I've combined your idea with a lineloc for quick release plus adjustability.

These ideas may have already been posted because your post is from 2008. If so I apologize for not giving the poster appropriate credit.
Daryl