When you thought that OOXML was enough trouble, XPS comes to be talked about. Many people just ask why Microsoft decided to create a "standard" (OOXML) to something that already had one (ODF). My answer is: "why should they use what everyone uses, when they can make anyone use what they're using?". Sucks, I know. But OOXML was just a start: now I start to understand why Marcos Santos (from Microsoft) kept saying "we should look into the future". Is the future "let's replace every standard with a Microsoft format"? Seems so, considering they're now trying to make XPS an ISO standard.

Here's a nice looking table where you can easily understand what am I talking about (shamelessly copied from this post):

Origin Microsoft Microsoft
Editor Microsoft via Rex Jaeschke Microsoft via Rex Jaeschke
Standards Body Microsoft via MS-ECMA Microsoft via MS-ECMA
Patents Microsoft promise OSP Microsoft promise CP
Duplication ODF ISO26300 PDF ISO32000
ISO Liaisons ISO/IEC JTC 1/SC 34 ISO/IEC JTC 1/SC 34
ISO plans in progress will be submitted to ISO
Restricted technologies WMA, WMV, MP3, OLE, Binary space, Macros HD-Photo

So, it seems that after forcing their own replacement for ODF, they're now trying to do the same for PDF. What will come next? HTML? Place your bets...