utdemir

With this plugin, you will get two links; One link for the image, and one link for the redirect page. Then you can use these links in a forum signature like this:
[url=example.com/wp-content/plugins/p2i/1.php][img]example.com/wp-content/plugins/p2i/1.png[/img][/url]
It also supports shortening the url’s with “is.gd”.

WP-Posts to Image Plugin

Let's you show your blog's last posts on a forum signature or stg. uses bbcode.

tranchesdunet

<a href="http://www.tranchesdunet.com/sidenails/" rel="nofollow ugc">SideNails</a> was first developed for my own use. But I think it could be useful to someone else 😉 
Basically, SideNails can do one thing : 
– get an image from your post, and use it in a widget to make a thumbnail link to this post.
Of course, you can customise the “last post” : you can setup the number of posts shown, and also filter these posts by categories and/or tags. 
The images used to make the thumbnails can be from the post’media library, a post’featured image, a NextGen Gallery linked to the post, or a custom fields where you setup the link to this image. 
You can also change the default size (even if it’s not recommanded) to your choice.
In bonus, there is also a specific template to be used with YARPP Plugin. It allow you to display the related links with the same thumbnails.
Note on the support : 
For better support, I will only answer question/suggestion/etc through a dedicaced page on my website : www.tranchesdunet.com/sidenails 
You can post either in english or french (preferably).
Feel free to test it and report any bugs/suggestions

SideNails

SideNails allow you to display a list of the last posts with a thumbnail, in a widget. For this, SideNails use the images linked to your post (thumbna …

WP-Posts to Image Plugin vs SideNails