I am using vBulletin 3.0.6 and a CMS program called Subdreamer at: http://www.canyoneering.net
Our users need a gallery with more features than those available with Subdreamer's built-in Image Gallery. I'm looking at your program and PhotoPost PHP because they both integrate with vBulletin so users won't have to re-register.
Any concerns regarding using your program with Subdreamer? All Subdreamer tables in DB start with "sb_".
How about a quick comparison between your program and PhotoPost? I found both programs recommended in the vBulletin forums.