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Very simple introduction to the concept of settlement hierarchy:
http://www.slideshare.net/RichardH/1-what-is-a-settlement-hiearchy

Activity:
http://www.effectiveict.co.uk/flash/training/flash19/Settlement%20hierarchy.swf
http://www.geointeractive.co.uk/subsample/setthierarchy.htm

Very useful for recapping site, situation, pattern, function and hierarchy:
Settlement Characteristics Worksheet (from http://www.geographyalltheway.com)

Recap:
http://www.bbc.co.uk/schools/gcsebitesize/geography/settlement/set_charrev4.shtml
http://www.geography.learnontheinternet.co.uk/topics/characteristicsofsettlements.html#function
http://www.s-cool.co.uk/gcse/geography/settlements/urban-hierarchies.html