OK, Valve, Half-Life was pretty awesome, but it's been years without word about the sequel...what's that, it's being released in 2003? AWESOME! Wait, what's this beta footage? Ugh! That looks awful! DO NOT WANT. And what's this?? The game has been delayed?! It'll never get made! Valve sucks! But what's this? In 2004, Half-Life 2 was actually released. Jaws drop, hearts skip beats, and everyone immediately pretends they never doubted the mighty, mighty Valve.
When Valve initially announced that the Heavy of Team Fortress 2 was getting an upgrade that allowed him to rejuvenate health, the initial reaction was anger over the Heavy becoming too unbalanced. Then they released the Sandvich trailer. It promptly became the best update ever.
Portal 2soundtrack in volumes 1 (released on May 25, 2011), 2 (on July 1, 2011), and 3 (on Sept. 30, 2011).
Even more rejoicing involved when Valve stated they're going to release more Portal 2 comics and videos.
Valve's weekly mutations for Left 4 Dead 2. The first one, Realism VS, was incredibly popular to the point that based on a poll Valve took (almost 60% of people wanted Realism VS back!), they actually listened and announced they were going to make Realism VS a permanent add on to the game. Cue in much rejoicing.
Valve announces they are porting Steam to Linux! That is the intersection of two fandoms rejoicing like crazy.