To celebrate Day of Defeat: Source's upcoming one year anniversary Valve will be releasing a major update next week on the 28th.

"The Map Pack, which arrives just before DoD: Source's 1st birthday, introduces a new gameplay style, Detonation, in two brand new missions (Jagd, Colmar).
In addition to the new missions and gameplay style, the Summer 2006 Update also introduces new technical features and gameplay enhancements to Day of Defeat: Source. Some of the new gameplay enhancements - such as spawn clip adjustments, improved hit location detection, and weapon balancing - were made after reviewing the player statistics gathered since the stats (www.dayofdefeat.com/stats) feature was added to DoD: Source earlier this year.

Since it's original release in the fall of last year, Valve has introduced a number of new features, missions, and enhancements for the game - following in the company's long tradition of ongoing development for its online properties."

I can't wait; I play DoD: Source regularly and some big updates will be great.