Counter-Strike: Source Update Released
Product Update - Valve
Updates to Counter-Strike: Source have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Counter-Strike: Source
Fixed new weapon firing integration causing some guns to over-fire on single taps
Fixed a couple of cases where machine guns could skip slightly with enough lag
Fixed c4 explosion pre-caching
Added precise audio timing fixes for client-side prediction
Increased the tolerance for skip detection in client side audio to prevent sound dropping out due to client clock drift
Completed work on clan tag strings validation