A lot of the anti-DRM discussion tends to focus on how much of a pain in the ass DRM is when customers buy content and want to use it on different computers or other devices. But an even bigger problem hits when a company inevitably decides to switch to a different DRM system, goes out of business, or discontinues a service. last100 has a great post about 5 Companies that Sold Customers Down the DRM River. It’s a word of warning to anyone considering buying content with DRM.