If you are new to Steam and the Half Life series in particular, this weekend is the perfect time to experience the complete Half Life universe.  You can get 66% off the Half life complete pack which makes it US$16.99 or grab selected individual Half Life Titles on the cheap.

I have had most of the original Half Life series games since the won.net days, but now seems the perfect opportunity to gift some of my more stubborn un-Half Life playing friends.