Time Travel Paradoxes - Some lovely paradoxes when time travel would be possible.

Endeavor Into Time - An informative site about time travel and its related interdisciplinaries.

Time Travel for Beginners - Time travel explained by the use of Einstein and wormholes.

Chronus Project - An in-depth look at the conceptual idea of time, is time travel possible?

Star Chamber: Experimental Time Travel - Star Chamber website explores a new method of making time travel possible, using existing technology.

FTL Temporal Signaling Device - Discusses quantum tunneling device to send signals backwards in time.

Time Travel - The possibilities of time travel approached by Einstein's relativity, wormholes, black holes, ...

The relativistic asynchronous machine - Design of a hypothetic machine for travel into future