Where is debugging mode on Kindle Fire? I want to connect Kindle Fire with Eclipse to develop apps but I don't see any entry like "Development" in "Settings". What's wrong with it? If it doesn't exist on KF, is there any way to do that?
When I open Manage on Windows XP, a yellow exclamation mark appears on Kindle. Is its driver missing?
It is always enabled on the Kindle Fire. You simply need to add the Fire's device ID to your android_usb.ini file so that the Google ADB drivers will find it. You can do this from the command line very easily with:

echo 0x1949 &gt;&gt; "%USERPROFILE%\.android\adb_usb.ini


Then restart adb

adb kill-server
adb start-server


And you should be good to go.

If it still won't recognize it then you may need to go into the "Manage" menu and uninstall the Fire, then unplug it and plug it in again (I don't remember if that step was necessary).