Googler Tim Bray has posted more details about the Android Market rollout to new countries on the Android Developers blog. As always, it's an excellent read chock full of tips and instructions for developers, there's a bit of information for the end user we want to pass along to everyone about setting up your Android phone to take advantage of the new Market. If you've had paid applications all along, you're good to go but if you're in one of the new countries (Argentina, Belgium, Brazil, Czech Republic, Denmark, Finland, Hong Kong, India, Ireland, Israel, Mexico, Norway, Poland, Portugal, Russia, Singapore, Sweden, and Taiwan) you'll want to pay attention to the following:
For users to make a purchase of paid apps in these countries, they must have the latest Android Market client, which we have started to make available as a self-update and should reach all users within the next few days. This is a silent update; users will not see a notification and will not be prompted to do anything. If you want to accelerate the self-update process, launch Android Market, navigate back to the Home screen, and after 5-10 minutes, relaunch it.
If you haven't already received the clien update, give it a try and enjoy the complete version of the Market! [Android Developers Blog]