One of the many "favorite links" listed on the right side column of my blog is the N631S Blog. Frank posted a video that was posted on the AvSig online forum that really hits home to those of us who fly with IFR certified GPS equipment.
I don't want to steal Frank's thunder so please, take the time, read the blog post and post your thoughts. Here is the direct link to the post; Children of the Magenta Line.
Frank, thanks for sharing!