Example for PP Classifieds:
vBSEO Compatible Hack:Photopost Classifieds - VBSEO Wiki
There are many threads on
vBSEO concerning the custom rewrite rules and vBgallery which work to a certain extent however there duplicate content issues that appear to make everyone there, erm, angry
Also, there is this:
vBSEO Functions for Extensibility - vBulletin SEO Forums