It seems obvious to me that a huge portion of people in the transhumanist future of Eclipse Phase will spend a significant amount of time in simulspace, and at least a significant fraction will likely never want to leave their virtual worlds. Given that, let's come up with some ideas of what sort of simulspaces people spend their time in.
I'll start us off:
1: Twisted Matrices. Inspired by The Matrix trilogy, this ironic simulspace contains three layers: A post apocalyptic rebel group of humans fights against the machine intelligence that has taken over the world by hacking in to the VR program to which most humans have been forcibly uploaded. Within that simulspace, a shadow war is fought over corporations that have developed their own virtual reality simulations. Accessing these simulations dumps you into other popular simulspaces, or in at least one case, simply logs you out of the simulspaces and dumps you back into your own body, with the implication that your reality itself might be a simulspace.
2: Up the beanstalk: players find themselves in a castle of long-dead giants, which they explore and colonize, fighting off oversized vermin and overcoming engineering difficulties like how to open a seventy foot tall door.
'No language is justly studied merely as an aid to other purposes. It will in fact better serve other purposes, philological or historical, when it is studied for love, for itself.' --J.R.R. Tolkien