There is also one more place of articulation, and that is the pharynx. In the worlds languages, these sounds really only occurs as fricatives, and are common in Arabic, in the letters &ain' and 'Haa'.'
The sound Haa' is like 'h,' but much stronger sounding, as if you're trying to say 'h' very audibly. &ain, which has absolutely no equivalent in any of the languages of Europe, is the voiced version of this, and is very hard to notice if you did not grow up speaking Arabic or one of the other Semitic languages which use this sound.
A good example of the uvular point of articulation is the 'r' of French and many dialects of German, as well as the letter 'qaaf' in Arabic. Just try to say the letter 'k,' but keep moving it back, and eventually you'll have made a voiceless uvular stop. Sometimes English speakers will do this with /k/ around back vowels, liek in the word 'walk' in some people's dialects.
A familiar example of the glottal point is the simple sound /h/, which is the 'h' of English and is simply made by blowing air through the glottis.