A new patch has been released for Quake 4 which allows you to communicate with other players using voice chat during multiplayer matches.
The v1.1 beta patch also fixes a number of problems and adds a bundle of new gameplay features to both single and multiplayer modes, such as a one minute warning for tournament matches, HTT support, a forcemodel option and so on.
You can find the full details and download the patch over at WorthPlaying.com. A word of warning, though: once you've installed it, you'll only be able to play against others who've done the same, and save games created in previous versions will no longer be accessible.
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