What is it worth ...
I've been using Addendum for a year now and I found it ridiculously easy to use. Its extension for the PHP Reflection API is seamless, and it supports many more use cases than the Doctrine Annotations component.
It lacks namespace support, but I could use the AnnotationMatcher class to accept classes with names (without getting false matches with docblock tags), and it works like a charm.
Doctrine annotations take into account PHP 5.3 instructions. The only thing that does not add Addendum, and IMO, it would not be so trivial to implement.
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