Here are some fan-made pictures of Half life 2 Episode 3, just to keep the hype up =)
And, from the Black Mesa Source, there is a new wiki about the game to check out: http://wiki.blackmesasource.com/index.php/Main_Page
And some videos:
And Black Mesa Source Songs:
Note: I'll constantly update this thread when any news about Half Life comes to light =)
Hope you enjoy it.