Following Marks blog? (New Garden stuff)

I noticed something recently about the new backend he is coding (http://markosullivan.ca/blog/?p=83). He mentions Northwind, MS SQL. Don't have too much knowledge on these particulars but a quick google showed me that these are alternatives to MySQL (from Microsoft of course). Which were Windows only, I did not see any Linux versions etc. Can someone please tell me otherwise (shed some more light?), I hope he is not alienating 90% of the intarweb servers to run future Vanillas.
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<shameless plug>I however prefer xPDO, which is an extension to the aforementioned layer.</shameless plug>