Counter-Strike: Source Update Plans
There will be a significant change to the aesthetics of the radar, but there are also some fairly significant gameplay ramifications to the new system. One example: when you look directly at an enemy for a long enough time for their name to appear on your screen, everyone on your team will be able to see that enemy in the radar. We're planning on releasing this first update in about two weeks.
In other Valve news, an updated Source SDK is now available.
From The Chatty
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Sounds sorta like how planetsides radar works.
If you can see an enemy, you transmit their location to everyone via the radar. If an aircraft with radar flies over, it picks everyone up bar cloakers and transmits that to everyones radar.