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yes, I did :)
function plugin_emoticons_filter($string) {
    static $EMOTICONS = array(
    'O:-)' => 'angel.gif',
    ':D' => 'biggrin.gif',
    ':-D' => 'biggrin.gif',
    ':hand:' => 'bye.gif',
    '8)' => 'cool.gif',
    '8-)' => 'cool.gif',
    '%)' => 'crazy.gif',
    //':\'(' => 'cry.gif',
    ':wall:' => 'dash2.gif',
    '>:-)' => 'diablo.gif',
    ':rose:' => 'give_rose.gif',
    '<3' => 'heart.gif',
    ':-*' => 'kiss3.gif',
        ':*' => 'kiss3.gif',
    ':inlove:' => 'man_in_love.gif',
    ':no:' => 'no.gif',
    ':ky:' => 'patsak.gif',
    ':(' => 'sad.gif',
    ':((' => 'sad.gif',
    ':(((' => 'sad.gif',
    ':-(' => 'sad.gif',
    ':-((' => 'sad.gif',
    ':-(((' => 'sad.gif',
    'O_O' => 'shok.gif',
    ':)' => 'smile.gif',
    ':))' => 'smile.gif',
    ':)))' => 'smile.gif',
    ':-)' => 'smile.gif',
    ':-))' => 'smile.gif',
    ':-)))' => 'smile.gif',
    ':-P' => 'tease.gif',
    ':P' => 'tease.gif',
    '$(' => 'wacko2.gif',
    ';)' => 'wink.gif',
    ';-)' => 'wink.gif',
    ':yes:' => 'yes.gif',
    'xD' => 'rofl.gif',
    ':rofl:' => 'rofl.gif',
    // etc etc
    );

p.s. Sorry, don't know what a tag there for code paste

No ned space :P try this:

<?php
/*
Plugin Name: emoticons
Plugin URI: http://www.flatpress.org/
Description: Adds emoticons to FlatPress
Author: NoWhereMan
Version: 1.0
Author URI: http://www.nowhereland.it/
*/

/*
put your imgs in FP_CONTENT/emoticons/
(tipically FP_CONTENT is fp-content/ )
*/

define('EMOTICONS_DIR', BLOG_BASEURL . FP_CONTENT . 'emoticons/');

/* now please notice how I follow this naming convention: */
function plugin_emoticons_filter($string) {
static $EMOTICONS = array(
':)' => 'smile.gif', // of course format can be whatever; I use PNGs
':(' => 'sad.gif', // these are the images you have in fp-content/emoticons/


// etc etc
);

$ed = EMOTICONS_DIR;

foreach ($EMOTICONS as $emo => $img) {
$string = str_replace(
"$emo", /* replace one of the codes defined above,
  when *sourrounded by spaces* :P */
"<img src=\"{$ed}{$img}\" alt=\"{$emo}\" width=\"30\" height=\"30\"/>", /* with the <img> tag
  .emoticon class can be styled as you prefer in your css (no necessary)*/
$string
);
}
return $string;

}

/* and now, don't forget to register to the hook */
add_filter( 'the_content', 'plugin_emoticons_filter' );
/* if you want it in comments too */
add_filter( 'comment_text', 'plugin_emoticons_filter' );

?>