[Nxt] What advanced feature to add in the first place?

[BCNext]

The development of Nxt basic features is almost done.  Now it's time to decide what an advanced feature will be developed in the first place.  Please, vote and comment.  A thread about Nxt can be found at https://bitcointalk.org/index.php?topic=303898.0

Messaging
Storing messages in the blockchain.  The amount will be determined by the length of a message, this money will be destroyed increasing value of all other coins.  Such messages can be used as digital contracts because they will be signed with the account key.

Two-phase payment
A payment that must be commited.  This should stimulate sellers not to cheat their customers.  A payment can't be rolled back and the sender can't get the funds back in any case.

Voting system
A tool that lets to vote on anything.  Number of voices is determined by the stake of coins.

Colored coins
A system that tracks ownership of any digital property.  More information at http://bitcoin.stackexchange.com/questions/5695/what-are-colored-coins.

Other (in comments)
Add anything that you think is more important.

[1715554153]

1715554153

[1715554153]

1715554153

[Come-from-Beyond]

Colored coins without doubt. This will be a killer feature.

[Adamlm]

Messages are also useful

[matt608]

I voted for colored coins but I'd be intrigued to know more about the potential voting system.  I also don't understand the two phase payment option.   Exciting to see you are so ambitious about this!

[BCNext]

The other features will be implemented later.

[matt608]

The other features will be implemented later.

Awesome! 

[bybitcoin]

Please focus on a clean well designed POS model implementation that solves the bloat problem too, and add the colored coins feature first before going for anything else!

[wezelvis]

coloured coins

[Come-from-Beyond]

Looks like colored coins is the winner

[BCNext]

2/3 chose colored coins.  So be it.

[BCNext]

Why?