This plugin displays in a widget the latest image from XKCD.

Garth Mortensen

Dashboard xkcd

Display the latest xkcd comic in your dashboard.

Dan Griffiths

XKCD Embed

A simple plugin to display XKCD comics on your website.

cubecolour

Correct Horse Battery Staple

Generates new user passwords in a style similar to those described in the 'password Strength' XKCD comic.

Darshan Sawardekar

xkcd-shortcode

Adds an [xkcd] shortcode that loads the XKCD webcomic by number.

skipstorm

This plugin displays in a widget the latest image from XKCD. It requires php 5.0 to work with curl and dom enabled, features included in most hosting. XKCD images are under creative commons licence so you’re free to display them on your site but you can’t remove the link.
I’m in no way related to XKCD, dough i admire that guy, so i’m not responsible for the content of the website. 
I did not ask permission to create this widget but as mentioned creative commons and so on.

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