I'm no longer supporting ZLog. It was ok in the AS2 and MTASC days, but since AS3 doesn't support custom tracing, it's a little bit out-dated now. If you still want to get your hands on it, you can download source or the old AIR package (haven't been tested with new versions of AIR).
It might come back one day if I feel the need for it!
Just go back to the index or pop by the blog.