There's no shortage of weather and news widgets for Android, but if you're using a Telstra SIM in your phone, Telstra's TelstraOne app might be tempting.
As well as offering news and weather (and not counting the associated data against your allowance), the app also tracks how much of your monthly data allowance you've used. The biggest selling point might be the inclusion of a usage tracking widget, so you can see how much of your included data you've used.
While unmetered content is welcome when you're looking at video, I'm not sure whether it would make much difference for a typical Android user. Telstra is bundling the TelstraOne app with the HTC Sensation, HTC Wildfire S and LG Optimus Black. Other Android owners can download it via the Android market, though if you're not using Telstra (and thus not getting unmetered access or a data-tracking widget) I really can't quite see the point.