[patvdv]

The 'sponsory categories' hack can be very simply implemented in vb3 if you do not mind not having fancy GUI options to manage your sponsor options. The way I did it is by using the new vb3template conditionals. Note that I am assuming that you already have the old solution installed, ie your 'forum' table has the 3 additional sponsorimg, sponsorurl and sponsorname columns added to it. If that's the case all you need to do is to edit 1 template:

Add following to your forumhome_forumbit_level1_nopost template:

<if condition="!empty($forum[sponsorimg])">
   <a style="float:$stylevar[right]; margin-right:10px" href="$forum[sponsorurl]" target="_blank"><img src="$stylevar[imgdir_misc]/$forum[sponsorimg]" border="0" alt="Proudly sponsored by $forum[sponsorname]"></a>
</if>

If you then make sure that the sponsorimg column only contains an image reference for the right forums, the conditional statement will make sure it is only displayed for that particular forum. Note: you will need a tool like phpmyadmin to edit the sponsors values in your forum table!