sounds like Half Life 2 all over again!!!
According to reports by numerous German gaming portals about 65% of the source code of S.T.A.L.K.E.R. found their way to the internet. The file, approximately 3.9 GB in size, is being spread in major file sharing programs since yesterday. According to the information of several download pages, the packet contains 8 levels in total, the DirectX 8 render, the full A.I. and physics engine and several missions....
http://stalker.myexp.de/en/index.php
According to reports by numerous German gaming portals about 65% of the source code of S.T.A.L.K.E.R. found their way to the internet. The file, approximately 3.9 GB in size, is being spread in major file sharing programs since yesterday. According to the information of several download pages, the packet contains 8 levels in total, the DirectX 8 render, the full A.I. and physics engine and several missions....
http://stalker.myexp.de/en/index.php