What OS xperia x1 can have?

Basicaly it is made for windows mobile. Lately unofficial works have been done to be able to use android. However it is still in progress because at the moment you can use all android features but it is not compatable with your external devices such as camera, gps, bluetooth etc.

What is the best cool media website?

At the moment one of the best "for fun" websites is www.9gag.com which is rapidly growing, easy to use and have great community.