It's a custom one I made for this site. It's really just some special css definitions and a new master view. I have no plans on releasing it to the public as it's very specific to this site's design.
@Mark, am I wrong to assume that the default Vanilla 2 theme has the same structure (if not the Vanilla-tastic style and header) as this site? (Still working on fixing my blasted server to install it myself and see)
Yes, this style is basically the Vanilla 2 style. There will be a few xhtml changes made this week (one of our community members has given me a bunch of fixes that need to be merged), but this is basically it.
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If not, I'd recommend you wait for the official release of Vanilla 2 before upgrading (we're thinking October for that release).