> I am looking for the appropriate place where I can call a script
> after every post (or modification) to to the wiki. Where would be
> the best place to do this?
There is no easy way to do this (yes, we need some "event framework").
If you want to hack some stuff, look at PageEditor.py _notifySubscribers().
What's already there is the notification function, the wiki can send you
an email on every page change.
It won't notify you on attachment changes.