A Steam client update is now available. To apply the update, click the File menu inside of Steam and then select "Check for Steam Client Updates...". The specific changes include:
Steam Client - Add D3D9Ex support for the in-game overlay (for ArmA 2)
- Fix unneeded assert/mdmp creation when Steam connection falls back to TCP
- Fix lobbies/chats trying to update metadata while disconnected from Steam servers
- View available downloadable content link on game's DLC tab now goes to game's DLC page in store
- Fix a potential memory leak with lots of friends notifications being triggered while a full screen window has covered the desktop
- Add a limit of queued friends notifications to show of no more than sixteen
- Fix a potential case of dropping input events in the in-game overlay
- Improved overlay compatibility with OSD from recent versions of RivaTuner
- Fixed Cloud sync issues when in offline modeFixed filtering by a mod in the server browser making it unable to retrieve servers from the master server
More... 
1st July 2009
Steam client update released 
