Indie Royale decided to start surprising people with unannounced bundles. Their first surprise is The Serious Sam Pack. The current price is a little over $4. There's less than a day left!

Serious Sam: The Random Encounter
Serious Sam: Double D
Serious Sam: Kamikaze Attack
Serious Sam: The First Encounter (not HD)
Serious Sam: The Second Encounter (not HD)
Serious Sam: The Greek Encounter

I bought Double D earlier and found it quite fun. I've also been playing the HD versions of The First & Second Encounters sporadically with my cousin. They're pretty much the only FPS games I touch. (Granted, being able to switch to a third person perspective helps my stomach.)