Nintex is currently working on a number of products for SharePoint Server 2010 including Nintex Workflow 2010, Nintex Analytics 2010, Nintex Workflow for Project Server 2010 and Nintex Compliance Suite.
For more information visit the Nintex: http://www.nintex.com/en-US/Products/Pages/SPS2010Products.aspx
One more solutions that expand SharePoint Workflow possibilities: HarePoint Workflow Extensions for SharePoint
It includes about 200 new activities and 30 of them are free.
http://www.harepoint.com/Products/HarePointWorkflowExtensions/Default.aspx