Starting today, if you have a registered Application ID, you'll be able to see daily usage data from it. For those of you running web servers, this probably won't be interesting news - you can just view your logs - but we think application developers will find this a useful new feature.
The Usage Tracking page requires you to be logged into your Yahoo! account (you will be redirected to a login page if you aren't). It will show you data (starting April 1) for all your registered Application IDs, including ones that have not received hits.
We hope you find this feature useful as you send your applications out into the world. As always, please feel free to make suggestions in the comments here, or on our Feature Request wiki page.