What will the earth look like when the continents recollide? What will the climate be like? Assume global warming has been taken care of.
There are a couple of very cool animations on YouTube of the future supercontinent: Pangea Proxima. One is by Christopher Scotese (video) and the other is by Algol (YouTube or also a longer animation with a longer history). The PALEOMAP Project page contains a fair amount of information as to how they estimate the evolution. With regard to the future climate, that is a really tough question that I don't feel qualified to answer.
Also, even though it does not include the future supercontinent, I really like the EarthViewer interactive tool. It has lots of information and it is very intuitive to use.