O.K. here goes:
Anathem (Neal Stephenson):
Stephenson conjures a far-future Earth-like planet, Arbre, where scientists, philosophers and mathematicians—a religious order unto themselves—have been cloistered behind concent (convent) walls. Their role is to nurture all knowledge while safeguarding it from the vagaries of the irrational saecular outside world. Among the monastic scholars is 19-year-old Raz, collected into the concent at age eight and now a decenarian, or tenner (someone allowed contact with the world beyond the stronghold walls only once a decade). But millennia-old rules are cataclysmically shattered when extraterrestrial catastrophe looms, and Raz and his teenage companions—engaging in intense intellectual debate one moment, wrestling like rambunctious adolescents the next—are summoned to save the world.
Lord of Light (Roger Zelazny):
a science fantasy in which the intricate, colorful mechanisms of Hindu religion, capricious gods, and repeated reincarnations are wittily underpinned by technology. "For six days he had offered many kilowatts of prayer, but the static kept him from being heard On High." The gods are a starship crew who subdued a colony world; developed godlike--though often machine-enhanced--powers during successive lifetimes of mind transfer to new, cloned bodies; and now lord it over descendants of the ship's mere passengers. Their tyranny is opposed by retired god Sam, who mocks the Celestial City, introduces Buddhism to subvert Hindu dogma, allies himself with the planet's native "demons" against Heaven, fights pyrotechnic battles with bizarre troops and weapons, plays dirty with politics and poison, and dies horribly but won't stay dead. It's a huge, lumbering, magical story, told largely in flashback, full of wonderfully ornate language (and one unforgivable pun) that builds up the luminous myth of trickster Sam, Lord of Light. Essential SF reading.
Hyperion (Dan Simmons):
On the eve of Armageddon, with the entire galaxy at war, seven pilgrims set forth on a final voyage to Hyperion seeking the answers to the unsolved riddles of their lives. Each carries a desperate hope--and a terrible secret. And one may hold the fate of humanity in his hands.
If there are any problems, I can take out the descriptions