It's a pretty hard sell to get people to put in the time required for a good beta when you're talking about a mission critical / time consuming application like this.
I'll also get to meet several of the openhealth mailing list members there. So we will probably have an opensource BOF of some type.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!