I like this idea [I]but[/I] I don't know how practical it is. That is to say...I'd rather open my HUD via the Ghost and have a new tab called "Grimoire" which just lets me easily navigate through the cards. A library in the Tower could look gorgeous and be fun to visit, but if you have to load up the Tower and run to the library whenever you want to just read a Grimoire? I think that's a bit annoying (like having to manually turn in bounties at the Tower, which Bungie fixed in 2.0). So, yeah, the library would be a nice bonus but isn't necessary. The main goal for me is to have the Grimoire accessible inside the game, via a nice clean menu (Bungie have built a really lovely menu system, so I think they could do this very well).