Using the excellent instructions by Ingo Karstein I have built a workflow with an association form using VS 2010.
When I install the workflow using the 'Deploy' menu option in VS 2010 everything works as expected. However if I 'Package' the project (only generate the WSP but don't install and activate the feature) and install and activate using stsadm.exe (addsolution, deploysolution, activatefeature) the GuidAssoc form parameter is the empty string (instead of a GUID as in the case when using VS 2010). Is there an additional install step that needs to be done (which VS 2010 does behind the curtains)? Or is there another configuration setting that needs to be added (in addition to the AssociationUrl)?