DE... Orca just stresses me out because I go back a long way with vBulletin and IPB. I have no problem with Orca for really light duty use. I actually prefer it for the groups and events forums. For the main forums, I sure like how IPB looks on my site. Besides, with IPB integrated, I easily added the IPB arcade mod (Free). Being able to add IPB apps is very attractive to me.

HTMLPurifer is the way to go. The only reason it's not in Orca in D7, is because Boonex was too lazy to put it in see more there. I think what they still use, is a derivative of safehtml.... created by some now deseased Russian guy. There is no documentation for it, and white listing will be a big headache. HTMLPurifer in Orca will make your life a lot easier when users start demanding the ability to embed videos from sites other than youtube.

As far as BBCode goes, I don't see how it's possible to implement that in a true sense, without giving up a lot of existing html formatting features... I could be wrong on that though.

I really believe that the lack of BBCode, and the inclusion of the usual mainstream features, are the things that could make a standalone Orca a viable commercial product