Microsoft has released a 60-day trial version of Microsoft Visio Premium 2010
>> Microsoft Visio Premium 2010 60-Day Trial
Microsoft Visio Premium 2010 takes diagramming to a bold new level with dynamic, data-driven visualization tools and templates, powerful process-management features, and advanced sharing capabilities through the Web. Bring the big-picture and real-time data from multiple sources, including Microsoft Excel 2010 and Microsoft SQL Server, together in one powerful diagram with vibrant graphics such as icons, colors, and data bars. Manage your processes with sub processes and rules and logic validation to ensure accuracy and consistency across the organization. Using Microsoft SharePoint Server 2010, you can create SharePoint workflows and export them for execution and real-time monitoring.
PLEASE NOTE: In order to utilize the advanced sharing capabilities for the Visio Services feature, you will need to obtain and install SharePoint Server 2010 (download the Enterprise CAL Edition).
>> Microsoft Visio Premium 2010 60-Day Trial