The 5.0.4 compile of the magickwand dll's is making a call "zval_copy_ctor" whose entry point no longer exists in ANY of the PHP 5.1.x php5ts.dlls. Hence the error messages when you try to start apache/php with this ext enabled.
The MagickWand for PHP library is being maintained. In fact a new version is scheduled for release in the near future that addresses some of the problems posted here. The delay in getting back to postings in this group is simply that there is too much work to do and too few volunteers. If you want to volunteer, we have a tons of work that must get done that could help free up time for the primary developers to answer questions on this forum. Currently, you will get an answer but it may take a month (or more) given our work load. In the mean-time lets hope a knowledgable user can post answers to pending questions in the forum.