Plugin Name: CommentLuv
Plugin Description: CommentLuv rewards your readers and helps you discover new and interesting posts by automatically adding a titled link to the comment authors last blog post when they comment. 
Plugin URL: http://comluv.com
Author: CommentLuv
Author URL: http://intensedebate.com/people/CommentLuv
Date Added: November 9th, 2009

Code:
var id_commentluv_plugin = {};
id_commentluv_plugin.id_post_luv_comment = function (){
}

// load jQuery if it doesn't exist
id_commentluv_plugin.id_luvload_jquery = function (){
/* load jQuery if it isn't already loaded */
   if (typeof jQuery == 'undefined')
   {
      s = document.createElement('script');
      s.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js';
      document.getElementsByTagName('head')[0].appendChild(s);
   }
    
} // end id_add_luvlink_field

// full document ready action
id_commentluv_plugin.id_loaded_luv_full = function (){
var commentluvDiv = document.createElement("DIV");
commentluvDiv.id = "luv_field_reply";
commentluvDiv.style.width = "400px";
commentluvDiv.style.clear = "both";
commentluvDiv.style.marginBottom = "5px";
jQuery("#IDCommentReplyForm1").append(commentluvDiv);
// add div to new thread text area
var new_thread_div = document.createElement("DIV");
new_thread_div.id = "luv_field_new";
new_thread_div.style.width = "400px";
new_thread_div.style.clear = "both";
new_thread_div.style.marginBottom = "5px";
jQuery("#IDCommentNewThreadForm1").append(new_thread_div);
// array to use for global settings and values
var cl_settings = new Array();
// lod the external script
id_commentluv_plugin.id_load_commentluv_script();
}
// add link to comment on submit filter
id_commentluv_plugin.id_add_luv_to_comment_text = function(text){
var id_luv_add_it = '';
if(cl_settings['request_id'] > 1){
// there was a successful return of a post or posts so add it to comment
id_luv_add_it = "\nMy recent post " + cl_settings['cl_post'];
// tell comluv what post got added
confirm_comluv();
}
return text + id_luv_add_it;
}

// load commentluv js function
id_commentluv_plugin.id_load_commentluv_script = function(){
var commentluvScript = document.createElement("SCRIPT");
commentluvScript.src = "http://comluv.s3.amazonaws.com/scripts/commentluvid-s3.js";
commentluvScript.type = "text/javascript";
document.getElementsByTagName("HEAD")[0].appendChild(commentluvScript);
}

id_add_action('comment_post',id_commentluv_plugin.id_post_luv_comment);
id_add_action('idcomments_func_load',id_commentluv_plugin.id_loaded_luv_full);
id_add_action('idcomments_init',id_commentluv_plugin.id_luvload_jquery);
id_add_filter('pre_comment_text',id_commentluv_plugin.id_add_luv_to_comment_text);

CSS:
#lastposts{
    width:375px;
    padding-left:5px;
    padding-bottom:5px;
    background-color:#fee;
    font-size:13px;
    border:1px solid #ddd;
}
.choosepost{
    background-color:#fff;
    line-height:1.4em;
    display:block;
    width:372px;
    border-bottom:1px dashed #bbb;
    cursor:pointer;
}
.cl_type_icon{
    margin-right:3px;
    border:none;
}
#IDCColumnURL{
    display: none !important;
}
#IDCColumnURLReply{
    display: none !important;
}
#IDCColumnURLLabel{
    display: none !important;
}
#IDCColumnURLReplyLabel {
    display: none !important;
}