The new radar for CS:S was among the more notable features of an update relased by Valve today. Other items contained in this release are:

- The radar display has been enhanced

- de_train has received a High Dynamic Range (HDR) lighting treatment, as well as some bug fixes and layout tweaks

- The players eye height while crouching now matches their in-game player model eye position more closely

- SourceTV now shows the weapon in first-person view

- SourceTV supports the tv_transmitall command

- Assorted exploit fixes

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Read their press release here:

http://www.steampowered.com/v/index.php?area=news&id=728

A lot of people are complaining about this update saying ct's and t's aren't being displayed properly for each team. Sometimes you will be on t and show up as a ct to your teammates. If that's the case, I hope they fix it fast.