-Collected about 6 pamphlets so far for my personal link book (whatever they're supposed to do).
They add new scenic elements to your Relto.
Also, the lot of you all probably want to find a new Bevin to join. When you enter the game you're automagically assigned to a numbered DRC Bevin... Your Bevin is your 'neighborhood', and the list of 'neighbors' in your Ki is the other players in your Bevin. Also, your upperleftmost book in your Relto library goes to your neighborhood's own Bevin.
Changing bevins is complicated but can be very worth it, since you'll have other players with you that are also smart enough to have changed theirs (and have enough good taste to have joined one with you in it). I'm in the Uru Obsession bevin, which has over a hundred players by now. Changing bevins is kind of complicated: You need to delete your original Bevin linking book (the square icon at the bottom of the book at the top left in your library). Then, you need to get someone to share their Relto with you and unlock their Bevin, and then when you use their Bevin link, you join their neighborhood. Caution: Not all players can share their Relto! It's a little buggy, and people who have slow computers can't always share theirs with other people (but the computer on the receiving end shouldn't matter).
One more thing. Your Nexus is awesome. If you're like me, then at first, you know your Nexus as "that empty room that a lot of books lead to, where you can't go anywhere or do anything except Relto back home". This couldn't be further from the truth. There's a thingamabob you can fiddle with on the machine in the Nexus, which acts as kind of a megalibrary: You can visit other peoples' bevins with it, in addition to having an easy way to cities and pod ages and other stuff like that! If you want to join a specific bevin, it's not a terrible idea to see if there's people currently in that bevin, and teleport there. Plus it looks cool.