DeliciousToBlog is a Greasemonkey user script for posting to the metaWeblog API using the del.icio.us posting interface.
You'll be asked to enter some information about your blog the next time you add a link to del.icio.us. (You can modify this information later by typing about:config in Firefox's location bar and filtering on the term greasemonkey.scriptvals. Fair warning: your blog's password is stored here. In plain text. Don't use this script on a public computer.)
The script works by adding a "post to weblog" checkbox to the del.icio.us form, which, when selected, uses GM_xmlhttpRequest and the metaWeblog API to send the post to your blog. The body of the post looks like this:
<p class="dtb_title"><a href="URL">DESCRIPTION</a></p>
<p class="dtb_body">EXTENDED</p>
<ul class="dtb_tags">
<li><a href="http://del.icio.us/USERNAME/TAG01">TAG01</a></li>
<li><a href="http://del.icio.us/USERNAME/TAG02">TAG02</a></li>
</ul>
Hashim, URL should point to your blog's metaWeblog API handler -- the location on your server of mw-xmlrpc.cgi if you use Movable Type, for example. publish is boolean -- 1 to have posts sent to your blog and published or 0 to have them sent to your blog but not published.