So I don't know how many of you already know (or care) about this, but Cyan just released URU Live for free.
I never played it myself, but I used to play the other Myst games (which were awesome), and this looks fun. If you have played URU, this is basically an online version of it.
Here's some info about the game:
http://mystonline.com/en/about/
For those who are too lazy to click, here's the gist of it:
Quote: "Myst Online: Uru Live is a massive multiplayer online game (MMOG) unlike anything else. Instead of repetitive kill/take/buy gameplay of other MMOGs, the very essence of Myst Online is to explore vast, fantastic worlds; savoring and uncovering new areas and new information at every turn. Exploring in Myst Online is an extraordinary experience, where immersing yourself in the environment gives you insight into how to move forward, and what went on before. You can explore alone, or share the journey with a select group friends or family from anywhere in the world. Create an online avatar and chat via text and voice, share images and clues, and explore the Ages of Myst Online together. You’ll rediscover, restore and rebuild the ancient city of D’ni and learn about the history of its fallen civilization."
Right now the servers are down, because they are adding in more capacity due to an unexpectedly large increase in activity. Also, be aware that even after downloading the client, you will have to download a gig or two through the updater (when the servers are up)!
Download page:
http://mystonline.com/en/play/
A few screens:
