The Team Fortress 2 Blog announces the promised Engineer update is now live, offering robot arms, mini-sentries, and other goodies for the Engineer class in the teamplay shooter. Steam News has the related patch notes for an auto-update for TF2 as well as Counter-Strike: Source and Day of Defeat: Source. The patch notes follow.

Engine

• Fixed client crash related flashlight usage.
• Fixed several issues related to alt-tabbing (invisible players, etc).

Team Fortress 2

• Added The Frontier Justice.
• Added The Wrangler.
• Added The Gunslinger.
• Added The Southern Hospitality.
• Added 35 Engineer achievements.
• Engineers can now pickup & move their buildings.
• Added Engineer main menu music.
• Added 4 new maps:
  • Thunder Mountain, a 3 stage Payload map.
  • Hightower, a Payload Race map.
  • Upward, a Payload map.
  • ColdFront, a community built Capture Point map.
• Item tuning:
  • The Sandvich now uses a cooldown timer, instead of the health pack recharge mechanic.
  • The Gunboats now reduce self-damage by 60% (was 75%)
  • The Tribalman's Shiv bleed duration reduced to 6 second (was 8), and its damage penalty increased to 50% (was 35%).
• Added better feedback sound for Pyros on when their flamethrower is doing damage.
• Fixed blood effect on bleeding player.
• Added a glow effect to Payload carts.
• Added Romanian language support.