Just read on BFG forum (in post by BFG staff on Technical Issues) that the game has been removed from the BFG website. It will be returned as soon as the technical issues are resolved.
Really? I just finished it yesterday. The "fix" for me seemed to be not to play it too long without exiting the game. Exiting the game forces it to save. There were some glitches, like the journal reappearing on the ground late in the game. But at least I managed to finish it. Of course the situation may be worse with Vista or Windows 7. I was using XP.
I hope they're able to fix it. It was a fun game.