[quote name='Salamando3000']Restart Steam and re-check your gifts. Just checked mine, and I have giftable copies of every Valve game I had previously owned...Portal, TF2, Half Life 2 (and all it's episodes), L4D 1 and 2...all there. You'll probably have a giftable copy of Portal 2 there as well.[/QUOTE]
Glad Valve decided to do this. They even gave me a gift copy of the one game I received as a reward earlier.
Some strangeness with my gift copies. After multiple restarts, I'm missing the original CS, HL2: Lost Coast (free, I know), and HL: DM - Source.
I've also got 2 copies of HL2, as well as a "Half Life 2 - Episode 1", and a "Half Life 2 - Episode One".