Sharepoint workflow: creating a task at another site

is it possible to create a task in a task list in a site other than the site to which the workflow is deployed to.

thanks

Nope - this isn't supported. The workflow must be deployed to all sites.

I assume you are talking about a SharePoint Designer Workflow and not a Visual Studio workflow where pretty much anything is possible.

You can either create a custom Activity in Visual Studio for use in SharePoint Designer or you use something like the Workflow Power Pack to add a little bit of custom code directly into SharePoint Designer workflows.

Please note that I have worked on the Workflow Power Pack, so consider me somewhat biased :-)