Basics of solid-state drives (SSD) including security concerns

Like many of the people who read this and other IT-oriented blogs, I've been keeping an eye on solid-state drive (SSD) technology for some time.  It seems likely to eventually do to hard-disk storage what digital cameras did to film, but how well do you understand SSD today?  What about security concerns such as encryption and drive-wiping?  I ran across this blog post on Tech Republic which does an excellent job of introducing you to the basics of SSD storage and includes a good introduction to the security concerns associated with SSD.  I hope it's helpful.