This XML code is the ProjectX API to post to both Twitter and Jaiku. This is a follow-up example from Post to Jaiku using ProjectX API [dzone.com]

xml_project = <<PROJECT
<project name='micro_blog'>
  <methods>
    <method name='post2jaiku'>
      <params>
        <param var='user' val='YourJaikuUserName'/>
        <param var='msg' val='YourMessage'/>
        <param var='location' val='YourCity'/>
        <param var='apikey' val='YourApiKey'/>
      </params>
    </method>
    <method name='post2twitter'>
      <params>
        <param var='user' val='YourTwitterUserName'/>
        <param var='msg' val='YourMessage'/>
        <param var='password' val='YourPassword'/>
      </params>
    </method>    
  </methods>
</project>"
PROJECT

This Ruby code uses the ProjectX API on rorbuilder.info to send a post to Jaiku.

Prerequisites:
1) You have a Jaiku account. see http://jaiku.com/
2) You know your Jaiku API key. see http://api.jaiku.com/

#!/usr/bin/ruby
# file: projectx_client.rb

require 'net/http'
require 'rexml/document'
include REXML

class ProjectXClient
  attr :doc
  def initialize(raw_url)
    url = URI.escape(raw_url)
    xml_data = Net::HTTP.get_response(URI.parse(url)).body
    @doc = Document.new(xml_data)
  end
  
end

if __FILE__ == $0

xml_project = <<PROJECT
<project name='jaiku'>
  <methods>
    <method name='post'>
      <params>
        <param var='user' val='YourJaikuUserName'/>
        <param var='msg' val='YourMessage'/>
        <param var='location' val='YourCity'/>
        <param var='apikey' val='YourApiKey'/>
      </params>
    </method>
  </methods>
</project>"
PROJECT
  
  pxc = ProjectXClient.new("http://rorbuilder.info/api/projectx.cgi?xml_project=" + xml_project)
  doc = pxc.doc
  puts doc
    
end

You can also pass the url including xml into the address bar and it will post to Jaiku successfully.
eg.
http://rorbuilder.info/api/projectx.cgi?xml_project="<project name='jaiku'><methods><method name='post'><params><param var='user' val='jrobertson'/><param var='msg' val='testing 223'/><param var='location' val='London'/><param var='apikey' val='5ugr6ttr754y214445'/></params></method></methods></project>"

Note:
Your api key is not in any way stored by the website rorbuilder.info.
Rorbuilder.info is a 3rd party developer website which is not part of Jaiku.com.

This code demonstrates a client server architecture. I executed the file simple_service.rb on my Ubuntu server (Donatello - 192.168.1.10), then from the CLI output I copied the server uri into the clipboard. I then executed the simple_client.rb on my Ubuntu desktop (Cryton - 192.168.1.3) while passing in the uri as an argument.

#!/usr/bin/env ruby -w
# simple_service.rb
# A simple DRb service

# load DRb
require 'drb'

# start up the DRb service
DRb.start_service nil, []

# We need the uri of the service to connect a client
puts DRb.uri

# wait for the DRb service to finish before exiting
DRb.thread.join

output: druby://donatello.mydomain.com:47159

#!/usr/bin/env ruby -w
# simple_client.rb
# A simple DRb client

require 'drb'

DRb.start_service

# attach to the DRb server via a URI given on the command line
remote_array = DRbObject.new nil, ARGV.shift

puts remote_array.size

remote_array << 1

puts remote_array.size

from the command line
> ./simple_client.rb druby://192.168.1.10:47159


output:
0
1


Note: I substituted the domain name with the ip address because the name in question was not stored within the DNS settings.

Reference: Introduction to Distributed Ruby (DRb) [segment7.net]