This seems to be the most promising "Tweet This" plugin yet. Can it not be somewhat similar to the "Tweet This" wordPress plugin, that essentially doesn't require anyone to store their userID/password - rather, it simply pulls a link.
Not sure how the variables would play out - but I'd think you could smack the code down in the SHOWTHREAD template.
An example (from how to make a easy "Tweet This" link in WordPress) is simply adding this:
Code:
<a href=?http://twitter.com/home?status=I just read <?php the_permalink(); ?> on your site name here!? title=?Send this Post to Twitter!? target=?_blank?>Tweet This Post on Twitter!!!</a>
Of course, the <?php the_permalink(); ?> is pulling the WordPress's blog URL ... but would there be a way to simply add this type of line in the template, and pull the correct code that vbulletin uses (ie. threadid=$threadinfo[threadid]&p=$postid) type info???
Just curious. If you knew PHP and could understand this hack to easily use "TweetThis" in WordPress, looks like it could port over to VBulletin easily?