Members Leave Comments on Non-vB Page

[greenhybrid]

I'm looking for the ability to let members post comments on non-vB pages. The comment area would preferably be something like that found from vB Articles at the URL http://www.greenhybrid.com/learn/art...d-vehicle.html

The trick is that the page isn't necessarily vBulletin related. I'm looking to tie it in with my hybrid mileage database on a page like this: http://www.greenhybrid.com/compare/m.../5-midori.html

P.S. I've also been looking for a way to make the /compare section of my site show visitors in vB's Who's Online with no success.