Also, I was surprised o hear they've been updating the original game (it now supports widescreen resolutions, and they've updated the in-game menu to the style used by HL2.
Then pick it up for about a dollar now. It's not gonna get any cheaper and Valve isn't gonna make it free. They know too much about economy to consider giving things away for free. Even if they sell just 100,000 copies of HL1 in the current sale, that's still $100K of "free" money that they won't mind stuffing in their coffers.