By default, the Droid will play the low-res quick loading version of a video on YouTube. I think this is a ridiculous choice given the Droid's fantastic display and 5GB "unlimited" data plan. Use this hack to set to the High Quality version of the video by default. If there is no HQ version, YouTube will stil play the low quality one.

1. Make sure your Droid is rooted and you have ADB working.
   Check out my guides on rooting and ADB
2. Mount the SD Card onto the computer and put this file in the root of the SD Card.
3. Unmount the SD Card.
4. Open up a new Terminal window and enter this command line code, line by line, pressing return after each line:

   export PATH=~/tools
   adb shell
   su
   mount -o remount,rw -t yaffs2 /dev/block/mtdblock4 /system
   cat /sdcard/YouTube.odex > /system/app/YouTube.odex
   mount -o ro,remount -t yaffs2 /dev/block/mtdblock4 /system
   sync
   reboot