so, whats the status on the isidor zeuner review?
Same as last month...
1. All code is open source.
2. We have prioritised development over documentation at this moment in time.
3. We have a bounty program for anyone that finds any issues.
so after way more than half a year there's nothing close to a cryptographic review, depsite people paying him more than 5btc?

Since you feel so passionate about it.. go ahead and arrange it.
This is a open source project; our in-house cryptographer is happy and quite frankly that is good enough for me for the moment.
It took bitcoins years to be peer reviewed so as I have stated before a single review quite frankly means nothing to me. I want to see dozens of them and they will come with time.
you guys paid someone who is not even a cryptographer more than 5btc for a cryptographic review that he didn't deliver after more than 6 months. I'm just curious why no one cares. I just read a pretty weak german article by zeuner on bitcoin and the healthcare system published one month ago. so at least he's alive and well it seems. I'll try to invite him again to the leipzig bitcoin meetup, so far he's never been there, despite being invited by a couple of people.
He hasn't done it because he needed some more docs from Shadow, but devs (and community agreed as well) decided to prioritize development instead.
Decentralized market incoming, a lot of work ahead.
As dasource wrote, code is opensource and available for anyone to review. I, myself, have donated to Isidor's review and I agree with further development instead.
I'm sure the review will be there someday, I'm not afraid of "losing" this donation.