Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
CFEngine is very extensive and powerful. In this presentation you will learn only a subset of what CFEngine can do. A mere tip of the iceberg, but this will represent the bulk of what you do with CFEngine. In other words, you'll learn the 20% of CFEngine that will do 80% of the work.
Presentation source for what's been going on with CFEngine for the last year. Typically this content is delivered by someone at Config Management Camp in Gent Belgium.