Uh oh, the site isn't loading now possibly due to the increased traffic. How's a business going to trust their mission-critical apps to be hosted on a site that's having trouble with the HN unveiling?

Great idea, but I don't see an untested open-source application disrupting SAP or Oracle anytime soon. Workday is even closer to that. The devil is in the details and even small errors in HR, such as vacation balances being off by percentage of an hour... or invoices not being penny accurate will test this product.