Left 4 Dead 2

Valve has released an update for the Left 4 Dead 2 Demo, now available on Steam for those who have pre-ordered.

The patch brings a few fixes and improvements to the trial version of the upcoming surivival co-op FPS. The download can be accessed by restarting the Steam client.

From the notes:

Left 4 Dead 2 Demo Updates
* Fixed bug that caused dedicated servers to become unjoinable over time without a restart or heartbeat update
* Fixed exploit that allowed players to end a campaign and return to the lobby without a vote
* Public players are no longer matched to lobbies that are idle for a prolonged period of time. These lobbies become “Friends-only” lobbies
* LAN servers list will now show listen server single player games as not joinable and will show game type as “single player” too

Source