I recently won this partially-used boxed copy of Half-Life Generation on ebay. It contains the original versions of Half-Life and Opposing force as well as a special edition T-Shirt which has a nice design to it.
Here is a quick video I made when it arrived which features a brief tour though the contents of the individual items.
Now to try and adjust my shelf layout to get this awesome collection on display.
Also I apologize to Vic as he was also trying to get his hands on this item but was beaten to it on the buying page!