I recently found Ogame, a free browser based massively multiplayer online game (MMOG) of space strategy (4x style). If you’re not familiar (yet) with these types of games basically you just need an internet connection and a browser and you are all set to start playing.
Playing Ogame is like a breath of fresh air brought to the space strategy 4x gaming experience since it offers the possibility to play anywhere I have an internet connection while offering a rich and free multiplayer experience.
See my review to OGame, some tips and a link to a good strategy guide in my blog by clicking here: http://www.spacesector.com/blog/?p=105
Let me know what you think about this game.
[blog]: Space Strategy Games Sector