Help – Bad Code

I am the NT admin for my companies webservers. Its a fairly complex setup with load balancing, failover for all servers, DB servers, PDC & BDC’s. Here is my problem, the programmers continuously puplish bad .asp’s and .dll’s each week which often crash the WWW service and cause other havoc. What would you recommend I should do to minimize the risk? Many of our applications require registry entries and ODBC changes as well. Of course we do have a QA department everthything must pass through. However, the live enviornment has many more variables.