Port ahoy!

Really nice article on the FreeBSD ports system, one of its best aspects. Also goes a bit into some of the other port interfaces, which is something I've been wondering about myself. What exactly are the pros and cons of portmaster, portmanager, and portupgrade? This article only talks about the latter one. I've been using portmanager, because it doesn't seem to depend on the package database, which I always find problematic.