SL downtime is always a handy time to read through the blogosphere:
Jauani Wu has an interesting new post on hub land
If you are interested in SL history, check out Phaylen Fairchild's blog Journey Through the Metaverse
Pham already linked to Philip's blog post about P2P and some of Gwyneth Llewelyn's thoughts, but I just want to highlight the comments section, especially Gwen's clarifications on her theories.
Speaking of LL blogs, I'm also a fan of Ben Linden's Bulk Upload.
Have you discovered Chip Poutine's blog, Virtual Suburbia? It's especially interesting if you are into building/architecture.