Dan Podsedly's blog
If you're new to Tracker, or are considering trying it out but haven't signed up yet, check out the Tracker 101 screencast. Thanks to Ian McFarland for recording it.
Nivi, from Venture Hacks, wrote a great article about why Pivotal Tracker is great for startups. It's worth reading even if you're already a fan of Tracker, and nails down the key ingredients to successful project management. Check it out:
We've released the first version of the Tracker API. It's a RESTful HTTP XML interface, uses a simple, token-based authentication mechanism, and allows you to query as well as update stories in your projects.
To get started with the API, read through the API Help page (it includes examples), and create a token on your Profile page.
We plan to enhance the API and add support for more operations and formats (including JSON) based on your feedback. Please let us know what you'd like to see added, either by email or via Satisfaction.