I also wanted to add ahentor note to this post so as to be honest about my experiences so far with PMOG. As of mid-April, I pretty much have the PMOG extension turned off. My experience is that if I leave it on, it becomes unresponsive within about 20 minutes and also turns my browser into total sludge. To be fair, I typically have 3-4 Firefox windows open with 5-10 tabs in each. I can see how this might be challenging. I think I may also be experiencing some conflicts with other extensions (I am especialy suspisicous of a conflict with Trailfire as they use similar mechanisms).I do not mean to damn PMOG with these comments. I stand behind everything I wrote. I think PMOG (and the broader phenomenon of these passive multiplayer online games) represent a hugely interesting way to look at education online, and not just (or especially not just) in formal education. But as with many things I look at, it seems to me to be pushing the boundaries and perhaps a bit technologically challenged. I know that others have had better luck so far, which may well depend on their local browser setup. For me it has been frustrating, to see something with so much tantalizing potential, but not be able to use it because it really has made the rest of web experience a slow, unusable one.