If you were wondering about the success of the Kindle Fire, look no further.

On Tuesday The Wall Street Journal joined a growing group of publishers who are focused on the Kindle Fire. In addition to their iPad and Android apps, The WSJ now also offers an Android app that has been customized just for the Kindle Fire. The app is free, and can be downloaded to the Kindle Fire from the Amazon Appstore. Subscriptions start at $16 a month.

This move should come as no surprise. The Kindle Fire is predicted to compete with the iPad as the best selling tablet for this Christmas season. There are a couple estimates out now that suggest that the KF will sell between 4 and 5 million units this year. In comparison, the iPad and the iPad 2 each sold around a million units in their first months.