Quick bug fix update:
1.2.2 Fixes a crash due to a missing implementation of __KVOAdditions__dealloc__original__ on NSObject.
1.2.1 now runs on the iPhone.
The new updates are in SVN at http://svn.shiftedbits.org/public/KVOAdditions/trunk and tagged at http://svn.shiftedbits.org/public/KVOAdditions/tags/1.2.2