BizUnit v2.0 is imminent...
Version 2 of BizUnit is pretty close to compleation, the new version has the notion of passing state between the individual test steps plus plenty of new test steps not ony from myself but also from a number of customers and Microsoft partners.
As I mentioned previously, for those of you that haven't used BizUnit, it's a framework for the rapid development of automated testing, it was initially targetted at BizTalk but it's not by any means restricted to it. A number of my customers, past and present have had great success using it.
If you have test steps that you like to have included in Version 2, please let me know, I'm aiming to get it finished in the next month or so.