Pretty cool, if the SeaMicro storage fabric could be added it would be even more fun, pretty awesome transactional machine in a rack. I would have loved to build a storage appliance out of a system like this when I was at NetApp.
The SLS FIA-2100 discussed in the article is a PCIe card, it works with x86 too. So it isn't the 'killer feature' for AMD ARM implied in the article.