1. you can use
http://example.com/forum/external.php?type=js
that will give you javascript page so you can manipulate some basic stuff. create a loop and style it the way you want. that's in the vbulletin documentation
2. you can integrate your vbulletin with joomla using jfusion component for joomla. they also have a mod that will display latest posts. not sure how customizable the mod is. prolly the best vbulletin joomla bridge imo.
3. if you want something very pretty you can integrate cyb top 5 stats but that requires an joomla index.php hack so you're editing their source code and will have to take note of that if there's any upgrades. you can see a sample on this site if you scroll down past the video (
http://www.ampprod.com/amp-live-tv-v...watch-and-chat)
4. vbadvanced offers something like that but i've never used them so i'm not sure how that exactly works.