The content of the wordpress post and the content of the vbulletin thread can be duplicated (by default it shows an excerpt in the vbulletin thread). I actually modify the vbulletin thread after it is created, but this software will create the link. Take a look at
http://www.disaster.com/infographic-...-winter-storm/
All of the comments at the bottom of that post are pulled in from a vb5 thread that was automatically created by the software. I then modified the thread a little to look nicer, but I love that it pulls the comments in, and then pushes you to vbulletin to make new comments.