On magic...
I really liked the list of alternative material components and their effects, and that mechanic is transparent enough to be dropped right into almost any D20 derived game- 3.X included.
A bit more problematic would be the higher/lesser versions of spells, but I think that this is worth the trouble.
The caster feats from AU/AE are also quite good, and I don't think they're a risk to just add in.
A side note on feats- Hands as Weapons is a very good feat that makes explicit what was implied in 3.X, and only explicitly
RAW for the Kensai class- that a Monk can have his unarmed strikes enchanted as per a manufactured weapon. If your players like monks, this is a must-have feat for your campaign.
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