An excellent episodic comic-style Half Life parody, featuring the misadventures of a City 17 resident called Gordon Frohman, who arrived some weeks before our favourite physicist...
http://www.hlcomic.com
Inventive use of ingame models and settings. Plenty of fun-poking at the games quirks, plus get a deeper understanding of the things Gordon saw, such as why there are so many explosive barrels lying around and what really happened to Ravenholm...