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Eclipse is the best editor I have seen so far, better than dreamweaver. Did not work with Zend yet.
To get phpEclipse module to work, first install Eclipse, then browse to the update menu: Help -> Software Updates -> Find and Install -> Search for new feautures to install
Then add a new site remote site to use:
http://phpeclipse.sourceforge.net/update/releases
And phpEclipse is installed