What is an enchanted book?
According to the Minecraft Wiki, an enchanted book is an item which allows players to add enchantments to weapons, tools, or armor by combining the enchantment book with one of said items on an anvil.
Can they receive any enchantment?
Testing in creative and survival mode shows that books can receive any enchantment that a normal weapon/armor/tool/other can receive. An easy way to check is to go into creative mode and use the new search function to search for the term book. This will show you what all the enchanted books are.
Can they receive more than one enchantment?
According to the wiki, books may only have one enchantment. This can be tested by giving yourself a bunch of books and enchanting them, then throwing them into lava or whatever you wish to do with them.
Since enchantments have different chances of occurring for different tools, materials, and at different levels, how are those probabilities different for books?
This would be different for books since books are not diamond swords. However, this would have that many variables because unlike a sword, books can only be made from paper. Swords can be made from diamonds, iron, and other materials. You would have to test this to truly know, but if John tells us how many levels he invested into his enchanted books, we might be able to know. Right now, though, it appears that the enchantment gives you the highest level (ex. Protection IV, Sharpness IV, etc.)
Yes many power tools and special armor can be enchanted. This may not be working as intended, so keep in mind future patches and updates may remove your enchantments. Use an anvil and an enchanted book of your requested effect, and voila!, your new drill or chainsaw now has Fortune I! Keep in mind that if you enchant an item that runs on an internal battery, and you allow that battery to run dry, the enchantment will be lost.
I personally do this to my Advanced Diamond Drill every game.
Best Answer
Found it - you just need to leave ench field empty:
{ench:[]}
. It makes item glow like enchanted but i doesn't have any enchantments at all!