I'ts better to use smart viewcache mechanism for doing the trick. You can set it up so everytime objects of certain classes are published, the home page object is cleaned. Check this: http://ez.no/doc/ez_publish/technical_manual/4_x/reference/configuration_files/viewcache_ini/class_identifier/additionalobjectids
hth!
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Xavier Serna
eZ Publish Certified Developer
Departament de Software
Microblau S.L. - http://www.microblau.net
+34 937 466 205
Thank you for the responses.
We won't do the custom workflow event, it seems to be too complex compared to the customer need... But a great improvement for eZPublish.