Produces output very similar to <a href="http://delicious.com/help/linkrolls" rel="nofollow ugc">delicious’s linkrolls script</a>, but in a way that isn’t guaranteed to mess with most themes.
Allows you to customize:
<ul>
<li>The number of links to display</li>
<li>Whether the link’s description is shown, if you provided one</li>
<li>Whether the link’s tags are shown</li>
<li>Whether the link’s favicon is shown</li>
<li>Showing only links with certain tags</li>
<li>And the ever-popular widget title</li>
</ul>
<h3>History</h3>
<ul>
<li>1.2.1: Bump the WordPress version and get rid of some legacy mentions of 
“del.icio.us”.</li>
<li>1.2: Update for the annoyingly backwards-incompatible nature of the new 
delicious.com design and v2 feeds api.</li>
<li>1.1: Allow multiple instances of the widget.</li>
<li>1.0: Initial release.</li>
</ul>

delicious-plus widget

Was a great plugin, but delicious have changed their API or discontinued the feeds or something, so it doesn't work anymore.
Edit: Found the solution. Just replace feed.delicious.com with previous.delicious.com in the PHP file.



Apparently doesn't work now

Makes available a widget to display your recent links tagged with delicious.

vfvalent

The Social Bookmarking RELOADED plugin for WordPress adds a list of XHTML compliant graphic links at the end of your posts and/or pages that allow your visitors to easily submit them in a number of social bookmarking sites. 
Furthermore, the plugin adds a page in the WordPress admin section that lets you customize it.
Social Bookmarking RELOADED support the list below: 
The following sites are supported: Del.icio.us, digg, FURL, blinklist, Socializer, reddit, Feed Me Links!, Technorati, Newsvine, Ma.gnolia, Google Bookmarks, GOOGLE BUZZ, Squidoo, BlinkBits, Stumble Upon, Netvouz, Rojo, Blogmarks, Co.mments, Scuttle, Tailrank, Bloglines, Segnalo, OkNotizie, Netscape, Bookmark.it, Ask, linkagogo, del.irio.us, Socialdust, Live MSN, Slashdot, Sphinn, Diggita, FaceBook, Upnews, Wikio, Barrapunto, Notizieflash, Fai informazione, Blogmemes, Blogsphere news, Blogsvine, Scoopeo, Myspace, ZicZac, Twitter, IndianPad, Technotizie, Blue Dot, Connotea, Diggitsport, Tipd, FriendFeed, digo, buzz.
In plugin .zip file, there is a pdf file about installation, usage of Social Bookmarking Reloaded in english, italian and spanish. 
You can see the video how social bookmarking reloaded works on <a href="http://www.savevideos.net/" rel="nofollow ugc">Save Video</a>.
<h3>Others</h3>
Update Instructions (from version RELOADED 1.8) – Aggiornamento del plugin (a partire dalla versione 1.8) 
Upload all the contents of the social-bookmarking-reloaded directory to your wp-content/plugins/social-bookmarking-reloaded directory. 
Delete the folder social-bookmarks-reloaded. 
Than activate the plugin in plugin menu of control panel. 
If your blog is based on WordPress 2.5 and newer, you can use automatic update in plugin panel.
If you would like to submit an useful social, that is not included in this plugin, important please send me an 18×18 icon and a link for submition e.g. www.soc ial.xz/submit?url={link}&title={title}. To do this, you can add a comment in a social bookmarking reloaded post. Thank you very much.
Send me the material I have mentioned before, otherwise I will ignore your request of inclusion. (I will not register every social request I receive.)
For social bookmarking RELOADED: valent 
http://www.valent-blog.eu
Based on GNU GPL plugin: 
Social Bookmarks 3.2

Social Bookmarking RELOADED

The Social Bookmarking RELOADED plugin for WordPress adds a list of XHTML compliant graphic links at the end of your posts and/or pages that allow you …

delicious-plus widget vs Social Bookmarking RELOADED