Nice mod. It was a bit tricky to install but it's great - using the latest version of vbulletin and wordpress.
I was having a problem with the links in vbulletin being incorrect - showing %postname% instead of the story title. I thought I'd post how I fixed it if anyone else was having a similar issue (I couldn't find a solution by searching but saw that others had experienced this).
If you change all instances of:
Code:
$link = get_permalink($the_post->ID, true);
to
Code:
$link = get_permalink($the_post->ID, false);
in vbbridge.php it fixes it. Upload the file and re-save your post and it should work (it did for me).