When using enchanted books in the new snapshot, not only can you enchant armor and tools with them using an anvil, but you can enchant every single item in the game, even another enchanted book.
MC-4250
Enchant anything with anvils
Resolved
Duplicate
0
Jasiah Helm
(Unassigned)
Unconfirmed
anvil, bookshelf, enchanted
Snapshot 12w49a
Retrieved
Duplicate of MC-4203. Please check before posting in the future.