A random search for ‘vodex’ has uncovered that I’ve suffered a similar fate to Chris Heilmann’s blog! (I read him after meeting at the Yahoo Conference in 2009, but that’s another story).
In my case, I was running a script I wrote several years back, “Thumbmaker”, and at some point had left some folders world-writable, which were abused by spambots (see his post for details).
Unlike him, I’d inadvertently cleaned the whole lot out when I upgraded my site recently.
They’re lurking in Google’s index for the foreseeable future; an example is http://www.google.com/search?hl=en&safe=off&q=site%3Avodex.net+avi.
As an aside, like Chris, I also have a Google Alert for ‘vodex’ but they’ve never shown up in there… implying that this is old spam, & this happened some time ago…