FAI not what I had hoped
FAI is too bloody complicated man. I've spent two days on it with success in step by step trial and error, but what a waste of time. I could have had eight nodes up in my beowulf cluster by now, which is really all I need. FAI could use some serious improvement before laying claim to being "better than kickstart", which works great with minimal reading. Again, FAI was just a waste of time.
A network traffic usage monitor.
A Magento order attribute extension that allows store owners to add custom fields to the checkout page.