The tools for multisig are admittedly poor, at the moment.
Multi-sig introduces an interesting concept: bitcoins that you
might be able to spend. Therefore, your balance only shows bitcoins when you control 100% of the private keys.
Right now, you need to take a few extra steps.
Some tools outside bitcoind exist to help with multisig, but in general, additional work is needed in this area.
Even that tool you posted still suffers from the same problem: *no one can tell that bitcoins were sent to them on a multi-sig address*.
In fact, they write:
6) Send bitcoins to the multisig address.
$ ./bitcoind -testnet sendtoaddress 2MsfxrcnDNF1kHJRxXT11TnAgDvVHkEvzSd 1.5
ad39b5d53230af4784fb46720e5bc474f16a97a2fc6e85eed5fd3ef423e97885
7) Time passes. Now, at least two parties are happy, and want
to spend the bitcoins.
Time passes. How much time? Are they sure the coins actually arrived?
IMO, all this could be solved simply by allowing the balance to include multi-sig addresses.
Cheers, Paul.