Impulse is offering weekend sales on Making History Gold Edition and Age of Booty for half off, On the Rain-Slick Precipice of Darkness Bundle Pack for $10.00 off, and the Hack and Slash Bundle for 75% off at $5.00. Meanwhile, Steam is offering Defense Grid: The Awakening for 75% off until May 13. Finally, Linux Game Publishing is holding a 24-hour sale on their penguin-friendly offerings (thanks Ant and LinuxGames).