A good basic plot and could, as manfred said, be a good campaign start location.
This strikes me as a good prologue, but some help on what to do next might be in the offing. A lot is left as an exercise for the student :)
An adventure to use with great care. I'd only use this if restoration was reasonably possible.
I like this idea - a decent reason for a dungeon to exist. And loads of fun all around.
The only weak part is the assumption the PC's are master builders. :)
A nifty little encounter.
An interesting Idea that I had also used - though I had not seen this post at the time.
A good basic idea that could easily be broadened into a great adventure!
A decent adventure start.
I agree with Pieh on this one. I like this as it could be a campaign affecting incident - religious schisms are frequent drivers of conflict.
Collections agents - now that could be a good job for a bunch of PCs - having to walk the fine line between legitimacy and larceny.
I think combining Strolen's with Ria's suggestions would make this more generally usable.