Time Travel in MMO’s
Something that Lars and Fred have been talking about is a time travel MMO. While there are a lot of pitfalls that need to be a avoided, I think the possibilities are endless. I don’t have a lot to say about this yet as I’m still mulling over some ideas, but here is something to check out if you are interested in this stuff at all. It’s the Grandfather Paradox. The basic premise is used in Back to the Future, but its an interesting read, so go look through it. I might be back today, not sure yet 
If not, then definitely tomorrow.
~Kanthalos
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Doctor Who uses time travel more as a vehicle to get from one setting (story) to another. The series tends to (rather ambiguously) imply that once you are involved with a chain of events you can’t change them. This helps preserve causality and avoid the messier bits of time travel. Some people might find it cheap, but its better to tell stories without headache inducing causality issues. In other words, just ignore them, you’re thinking too hard about this.
From Doctor Who:
Martha: “But are we safe? I mean can we move around and stuff…? It’s like in the films: You step on the butterfly, you change the future of the human race.”
Doctor: “I tell you what then, don’t step on any butterflies. What have butterflies ever done to you?”
Martha: “What if I killed my grandfather?”
Doctor: “Are you planning to?”
A first season (with Eccleston) had Rose try to change the past to save her father, with disastrous results. Basically, changing history branches it, and then that branch starts to die, killing everyone in it.