http://developers.de/blogs/damir_dobric/archive/2009/06/13/wf4-0-how-to-use-specific-datacontract.aspxUsing of specific custom contracts in WF4.0 BETA1 seem to be for many of us a feature which is not very intuitive. Personally, I would  always like to use well known good approach “Contract First”. Workflow Foundation approach silently seems to beenCommunityServer 2008 SP1 (Build: 30619.63)