For me, eBook reader formats are not an issue. I am firmly a fan of the Amazon Kindle and am not likely to switch in a hurry.
I, in fact, always think that with things like this, it’s never the best option to be messing around with mixing different formats etc, I like to just keep it simple, and stick to one supplier.
However, you may not be like me and you might want to own an eBook reader that supports a range of formats so that you can shop around for your eBooks.
If this is the case then you should definitely check out the eReader Format Table. Not the most beautiful thing in the world, but certainly very informative!
I hope that helps you if you are in the market for an eBook reader and want to make sure it supports the right formats for your needs.