I had to laugh when this error came up today when accessing LinuxWorld's website:
Microsoft JScript runtime error '800a138f'
'brandGlobalXML.selectSingleNode(...)' is null or not an object
/live/template1.asp, line 42
To be fair, it's just a conference company that organizes a wide range of conferences, not all of them focused on open source. Indeed, IDG also runs (or ran) the website for OSBC and ran it on a Windows infrastructure, too.
In both cases, it's still mildly ironic to see IDG making money with open source...but paying money to Microsoft.