T-Mobile G1 first buyers have not had all the applications that were originally planned to be pre-installed, but now they can go get them on the Android Market (50+ available now). At the moment, Android Market will only feature free applications, but paid apps will appear sometimes in the first quarter of 2009. It has been confirmed that paid applications developers will get 70% of the revenues generated, while the 30% will go to the wireless carriers and various processing fees. Google will not get a penny.
More on the Android developers blog