Resources for multisignature transactions? I am interested in using multisignature transactions to secure my company's coins and I'm wondering what tools are available right now for use with multisignature transactions? I'm especially interested in solutions that work on keys distributed between multiple wallets (no single wallet holds all the keys) and are not currency specific (would work just as well for Bitcoin as for Litecoin or other coins).

I know that the standard bitcoind API is lacking in multisignature support due to this bug.
blocktrail has a 2of3 HD Multisig Wallet API, it's setup like: 
 - the 1st key being your primary key to use
 - the 2nd key being a backup key you store offline and 
 - the 3rd key being a cosign key owned by blocktrail

it only supports bitcoin and bitcoin testnet atm though ...

https://www.blocktrail.com/api/docs#payments_overview