I've added a section on "What wallet to use", but I don't know all possible wallets by myself. Please check the updates.

Feel free to add to the list of wallets that do or do not allow importing a private key. Post here, I'll add it, give you credit, and delete your post. A short description how to import an addy would be nice.

For Blockchain.info it used to be possible to import addresses, but I'm not sure if it's still possible.