After posting this, I picked up a Scientific American special today about time. Should be interesting reading. I believe there's a piece in there by Paul Davies (http://www.edge.org/3rd_culture/davies/davies_index.html), who literally wrote the book (http://www.amazon.com/gp/product/0142001864/104-1674658-2098329?v=glance&n=283155) about time machines.

Some more here (http://fusionanomaly.net/timemachines.html). Watch out for bright flashy colors here and there.