If you are an Android developer and wanted to develop apps for Samsung Galaxy Tab, you do not have to wait for the $400-500-600 (Yes it seems Samsung and carriers want to push us towards Apple iPad).
Samsung just released an add on for the Android developer environment with customized emulator. If you have the Android Development Environment, you can add the Samsung Galaxy Tab add on via the AVD Manager on the Eclipse IDE.
You will need to add add on site "http://innovator.samsungmobile.com/android/repository/srepository.xml" letting you to download and install the development package and the emulator for the Galaxy Tab.
You can learn more at SamsungMobile.