Conjuration school, second level power (page 66) - This doesn't scale well at higher levels. A 20th level caster can cast Summon Monster I 10 times per day? I don't see that getting much use. Suggestion: allow a caster to burn additional uses to cast a higher-level version of the spell. E.g., for 2 uses, you get Summon Monster II, for 8 Uses, you get Summon Monster VIII. That way, your 20th level uber-mage can pull a 9th level Summoning out of his hat in case of emergency.
Same issue with Illusion school second level power (page 68). Similar suggestion, additional uses give better illusion.
War Domain second level power (page 78). Similar problem. Magic Weapon doesn't scale. It's always +1.
I'm not sure about the schools and domains that give Enlarge Person either, but I can see where some casters would still like that at higher level.