Check out a paper by Jon Callas. In it, Jon talks about solutions that he has proposed for making encryption more widely used. Download the PDF file.
I've written on this subject before. (See my "Secure E-mail collection" at here.) The technology and related software to easily use encryption has been around for 15 years. Aside from our apparent lack of belief in the need for it, the use of cryptography and the need for some level of ubiquity have been speedbumps for its use. Rather than go through the details, I suggest you listen to the webcast. Also, you can see my review of PGP Universal by clicking on Painless PGP.