You can't read them on the toilet, so what good are they? On the other hand, you can read them while MUCKing. But on the other other hand, reading large amounts of text in another window isn't exactly condusive to active and responsive MUCKing. On the other other other hand, the MUCKs I've been on have been kind of extremely dead lately.
War of Honor by David Weber is out in hardcover, and it's got a CD in it with the entire series (including War of Honor itself) on it. This is like a dozen books. If I hadn't already bought basically the entire series as it was re-released, it'd have been a much better deal, but there were a couple I hadn't been able to find.
It's a neat series... not really *hard* scifi, but not pure space opera. They put some thought into the physics of the situation. I think I like Elizabeth Moon's suspiciously similar Familias Space books better, because they focus on a variety of characters instead of on just one person. And because of the fox hunting. You should read both, if you like that sort of thing.
But not on CD, unless you don't own any of them. The big-ass hardcover is probably cheaper than buying the entire series piecemeal.