I am having the same problem and no one seems to have any answers or release dates or any info on the fact that they are actually working on a Netflix app for the android Samsung Charge. Some one please do some digging!
I read about a hack in which you change the phone name to Nexus One, or any other netfix compatible Android phone. You need root to do that but sounds really dangerous.
Not sure what negative impact changing your phones name would do.
go to the droid x forum they have an apk there that some how doesnt detect your type of phone should work on the charge i had it on my dx berfore my charge and it worked great for me! my dx was totaly stock!