Lost Alpha is a free addon for S.T.A.L.K.E.R. - Shadow of Chernobyl.
We sent out a big pack of old LA screenshots on r1 render to our fansite. Here is one shot, but for more, you should check: www.lost-alpha.com ! They (with KazakHD) are constantly updating the news section, there you can find more r1 render screens :) If you speak russian, or use google translator in chrome browser for instance, you can also read old flashbacks of the development of LA. Pretty interesting info, nothing new, but all old info is collected and re-presented pretty well with screens.