Until now I’ve run various test WordPress sites as sub-folders to this domain. However, with potentially insecure sites sitting in the same folder structure as this site this adds an understandable security risk. I’ve therefore purchased a secondary domain (MyWPPlug.in) from which I will now perform all development and testing.
Heading to any root URL for that domain will get you forwarded to my plugin portfolio page on this site. However, I have sub-folders for my test sites (which I don’t publicise) and bug tracking (I’ve also setup a redirect so my links to the old bug-tracking URL will forward to the new one – in time, I’ll correct these URLs), which now ensures that the only thing installed on this domain is the single WordPress installation.