the pegasos book which can be downloaded from the efika.org site is an excellent source of information, not just for the pegasos, but for morphos as well. the only problem that it is very outdated as it covers only morphos 1.4.5. no updates were made since 2.0 released. so it can be used but a lots of thing is obsolete in there. anyway a morphos newbie might find it handy and its really a very well written free book. you can download only the morphos part alone if you dont need pegasos specific infos.
no other book about morphos, a few articles but most of them from pre 2.x era (like "morphos, the lighning os").
DEAD pegII/G4@1000.1gb ram.radeon 9200pro
240 gigz hd.nec dvdrw.MorphOS 2.4 DEAD
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amiga1200T.blizzardppc@180/040@25.96megz ram
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zx.spectrum@3.5