I'm building a basic workflow through MOSS designer, as part of one of the conditions, I'm trying to determine whether or not I can determine whether or not the the user that created the workflow instance is a member of a particular group, if so act in one method otherwise just don't. None of the built-in actions seem to be able to accomodate this (they want specific users, not groups), any ideas? Thanks!
Unfortunately the actions in SharePoint Designer Workflows are extremely limited. We've had to install an open-source add-on component to get basic functionality like this: http://www.codeplex.com/SPDActivities
It worked well for us without any problems. However, you'll need to have permission to log intot he Central Administration server and add/deploy/activate the addin.