One of my readers was asking my opinion today about an ebook reader that he wants to buy, and he ran into a problem. Andrew was looking at getting a cheap Delstar OpenBook. It's not a very good ereader, and now that the company is dead (okay, there are 2 problems with this device).
But the real problem with the OpenBook is that it doesn't support DRM. There's not anything you can do bout that, so your choices are to either learn how to remove the DRM or find sources of DRM-free ebooks. (But explaining how to remove DRM is topic for another post.)
So you need to find DRM-free ebooks like the five stores and sites I mentioned in this post.
There is also a list of DRM-free ebookstores and free ebook sites over on MobileRead. I'm not sure how complete it is, but it's start.