Geek: Cryptographic “right answers”...

Geek: Cryptographic “right answers”...  This is a series of common questions about using cryptography with direct answers that are briefly explained.  Though it was written (by Colin Percival, a well-known guy in the security world) over four years ago, it still looks like good advice to me, jibing with more modern advice I've read.  This post is referenced from hundreds of web sites, but somehow I've never stumbled across it before...