Google Android Video Codecs

http://blogs.zdnet.com/Burnette/?p=1133

and to see the gory details:

http://android.git.kernel.org/?p=platform/external/opencore.git;a=tree;h=refs/heads/release-1.0;hb=release-1.0

Typical streams look like this:

3GPP - lower quality, H.263, AMR-NB audio, bit rates up to 192Kbps

MPEG-4 - higher quality, H.264, AAC audio, Bit rates up to 500Kbps

Also from the SDK 1.6:

Emulator Skins, Android 1.6 Platform

The Android 1.6 platform included in the SDK provides a new set of emulator skins, including:

• QVGA — 240 x 320, low density (120 dpi)
• HVGA — 320 x 480, medium density (160 dpi)
• WVGA800 — 480 x 800, high density (240 dpi)
• WVGA854 — 480 x 854, high density (240 dpi)

Besides these defaults, You can also create an AVD that overrides the default density for each skin, to create any combination of resolution/density (WVGA with medium density, for instance). To do so, use the android tool command line to create a new AVD that uses a custom hardware configuration. See Creating an AVD for more information.