http://www.joelonsoftware.com/items/2006/09/01b.html: "And since FogBugz goes back many years and was originally written in VBScript, Wasabi is 100% backwards-compatible with VBScript." (granted, VB != VBScript)
I'm totally wrong. I meant to write .NET (not ASP.NET) and .NET isn't even a language, so I'm doubly wrong. It's probably been four years since I've touched the code :\
It isn't written in VB and never was. In 2000 it was written in classic ASP (vbscript) and c++. Probably a few years after that it was converted to Wasabi, which at the time was very close to VBScript, but is now equivalent to C#. For the last few years it is shipped as a .NET product on both windows and unix, and the /Dev.html page you cited is accurate. (The articles you cited from four years ago aren't accurate anymore).
I love that first article; after many paragraphs extolling the "safe" choices, at the end he casually slips in that he's actually using a language that no-one else in the world is.
http://www.joelonsoftware.com/items/2006/09/01.html: "FogBugz is written in Wasabi, a very advanced, functional-programming dialect of Basic"
http://www.joelonsoftware.com/items/2006/09/01b.html: "And since FogBugz goes back many years and was originally written in VBScript, Wasabi is 100% backwards-compatible with VBScript." (granted, VB != VBScript)
http://fogcreek.com/Jobs/Dev.html: "Today we happen to use Wasabi, JavaScript, xhtml and CSS, and C++ to build FogBugz"