Blockchain.info wallets are pretty nice, they do client-side encryption with separate log-in and spending passwords (so your private key is encrypted inside an

Blockchain.info wallets are pretty nice, they do client-side encryption with separate log-in and spending passwords (so your private key is encrypted inside an encrypted .json file and the first password decrypts only the outer layer). You also get email (or dropbox or file download) backups that you can use in other Bitcoin clients in case something bad happens to blockchain.info.