i use an unlocked (no sim) sch-i905, so i don't know if it makes a difference, but this is what i did to get netflix working without rooting.

this is the netflix apk i used:
http://forum.xda-developers.com/show....php?t=1177969
  1. copy the transformer patch on to /sdcard/
  2. turn off the galaxy tab
  3. press and hold the power button
  4. once the samsung logo appears press and hold volume up
  5. let go of the buttons once the android icons appear
  6. android icon with downloading... text will be blinking, press volume up to move the blinking to the left to the box icon with the arrow
  7. press volume down to select that. now we're in the android system recovery menu
  8. press volume down to move selected text to 'apply update from /sdcard'
  9. press power button to select that option
  10. use the volume down button to scroll down to the transformer update zip
  11. press the power button to select that zip
  12. let android start up
  13. install the netflix apk
  14. watch netflix videos

this only applies the transformer patch and does not root the device, because at current, i'm not interested in having root.