Thanks for the suggestion.
As it stands, we don't have anywhere near enough discussion to justify a separate forum on that topic, but if it gets to a point where this changes, we'll be more than happy to consider adding it!
I know that vBulletin is capable of using sub-forums because I am a member of other forums that use this feature. Maybe, instead of a totally separate forum in the Digital Lifestyle section, it would be more appropriate to create an eReader sub-forum in the iOS and Apps section of the iPhone, iPad, iPod forum.