Is there a way in Illustrator to "snap" open paths to a curve or detect when they are not?

We are working on projects that are basically all open paths. However, we run into the following situation a lot:

If we change the shape of one curve, all other paths that had "intersected" are now off. Is there someway to keep an anchor point "snapped" to a curve? (Similar to connectors in OmniGraffle, etc.)

Or is there an easy way to detect where these have occurred in the document? "Join" doesn't work because they are not two anchor points.

Thanks.