good info for those that have an 8.9" ! also for development on the 8.9" its limited right now because of the locked bootloader but! there are some developers that have gotten around it and will release a custom recovery soon aswell as CM10 in the comming months, so once this is released to us many developers and modders will jump on making these two bad boys much more awsome (7" and 8.9"). more info on the development of both kindle HDs you can find here
http://forum.xda-developers.com/forumdisplay.php?f=1999