great, thanks. I just merged your code.

I use Electrum. because I am developing it 

hi dithi,

thanks, these are nice functionalities.
I would suggest we add them as options, instead of full commands.

for example:
with options, it should be possible to apply these options to both 'mktx' and 'payto', and to combine them

I added these features to Electrum.
See the announcement here:
https://bitcointalk.org/index.php?topic=50936.msg735942#msg735942

I just released Electrum version 0.38.

This version introduces new and experimental features: aliases and signed URIs

Aliases are dynamic pointers to Bitcoin addresses. They may be signed by a trusted authority, or self-signed.

Signed URIs are URIs that are signed by a merchant, with an address that is linked to the reputation of the merchant.
The goal is to provide a proof of payment for consumers (see https://bitcointalk.org/index.php?topic=58534)

See here for a complete description of aliases and signed URIs: http://ecdsa.org/bitcoin_URIs.html
Of course it is possible to combine both: Merchants may have their main address signed by a trusted authority, and use that address in order to sign the URIs they give to their customers.

These features are still experimental, and they are very likely to evolve.
I plan to write a Bitcoin Improvement Proposal (BIP) for them later.
However, I believe that it is important to get feedback from users at an early stage.
This is why I went ahead and wrote a demonstrator.

Changelog:
* aliases and signed URIs (see http://ecdsa.org/bitcoin_URIs.html )
* 'signmessage' and 'verifymessage' commands, same syntax as in bitcoind
* 'eval' command, that evaluates a python statement. Use it to examine or modify the content of your wallet from the command line.
examples:

yes this is something I have been watching closely.
for the last few weeks I have been working on adding new features to the client.
I will try to release 0.38 soon.

oh, and in soviet russia, the blockchain downloads you

in soviet russia, the internet pays you

there's a dedicated thread: https://bitcointalk.org/index.php?topic=53858

indeed, the command-line interface interface displays amounts with floating point numbers; thanks for spotting it, I will fix it.

it is not yet available for the official client gui (bitcoin-qt), except through drag and drop.
however, it should be available in the next release.

do you know about bitcoin: URIs ?
see here: https://en.bitcoin.it/wiki/BIP_0021
and here: http://ecdsa.org/bitcoin_URIs.html

why don't you sell there: https://bitmit.net

also here: http://bitcoinmedia.com/eurobit-rick-falkvinge-banks-the-fourth-victim-of-citizens-empowerment/

this is understandable.
I guess the official client should use a deterministic wallet by default.

yes.
do not forget to wait until the blockchain is fully synchronized everytime you use it; if you use it rarely the synchronization will take some time.

well, the official Bitcoin client is the defacto client proposed at bitcoin.org
it does not look like their policy is to redirect noobs to more user-friendly clients.

are you saying that the official client is written for a minority of users?
why doesn't it have a deterministic wallet?

This is not how I thought it worked.
Given that 100 addresses are pre-generated, I thought it would wait until they are all used until it generates another batch of 100.
This would be way safer, because you could warn the user that it is time to do another backup.