It is a pity you don't read French.  For those who do (or after you've learnt to read it), I would recommend *Annexe B* in the undergraduate text *Éléments d’analyse et d’algèbre (et de théorie des nombres)* by Pierre Colmez, and also his popular article [Un autre monde est possible][1].


  [1]: http://images.math.cnrs.fr/Un-autre-monde-est-possible.html