The update increases the number of levels up to 195. Wow, that's a lot and I doubt I'll ever go through them all as I haven't even finished the first release. Not that it's difficult or not fun, it's about the time I'm willing to devote to those cute Angry birds.
Besides the increase in the number of levels, Angry birds now supports QVGA devices running Android, obviously.
"We have fixed a number of issues that a lot of people experienced with Angry Birds on Android, including the lank screen issue on Android 1.6 devices, and the white textures appearing on certain devices."
Version 1.4.2 is available for download on Android Market and GetJar.