I have uploaded the notes I made on Cahn's book and used to give a talk to my esteemed fellow students at KCL in room 102 (All hail the Emperor!). These are a work in progress and are intended to give a speedy, rather than detailed, overview of the first few chapters of Cahn. http://www.mth.kcl.ac.uk/~ppcook/
Those interested in the emerging relations between E11 and M-theory could do worse than read Ling Bao's impressive masters' thesis "Algebraic Structures in M-Theory" which is in postscript format. Topics include nonlinear realisations, Kac-Moody algebras and symmetries in M-theory (principally E11), the conformal group and more... http://fy.chalmers.se/~tfebn/LingMasterthesis.ps
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It is...wearing blood-spattered marigolds while it cradles the limp carcass of its former incarnation...rocking gently on its feet...and humming...tunelessly.