Kelly McNeill sent in a pointer to this article
by Todd Burgess. Here's a quote from it: "The concept of Linux for the Masses is an honorable goal but one that must not be taken too lightly. The purpose of this article is to point out several of the current limitations in Linux and what should be done to create a usable system."
You might want to hit the links at the bottom of the article and check out some of Todd's earlier writing on the subject of Linux usability. You may not agree with him, but his opinions are always backed by sound thinking and are well worth reading.