Google is reportedly moving to patch a Wi-Fi Data Leak in Android. Android devices running Android 2.3.4 Gingerbread are not affected with the exception of Picasa http request.
To my recollection, there are less than a handful of Android devices running version 2.3.4 (and above) including Nexus One, Nexus S and Nexus S 4G. The upcoming Motorola Droid X2 will come with Android 2.2 Froyo.