I signed up, for $15, to listen to all the Major League Baseball games online, back on March 4. Shortly after this, on March 24, MLB.com announced a deal with Microsoft where they would make most content available only through Windows Media Player.
The short of it is that after I signed up, MLB.com changed the deal, and made it so I could only listen to the archived games -- that I paid for -- if I used Windows Media Player, instead of Real Player, as I had been doing.
This is called "customer service," where the customer is, of course, Microsoft, and not me. I am demanding my money back, of course. I hope many more people do the same.