Raise issues, add drafts. As you add a document, feel free to add a PR for its description to the README.

• Use Cases of Online Advertising "Hello Ads"
• Online Advertising Capabilities: Hit List of needs identified so far.
• Transparency via a Machine-readable Server Identity and Purpose Descriptor
• Privacy protecting metrics for web audience measurement
• Common User Flows
• Cross-Browser Anonymous Conversion Reporting
• Enabling browsers that belong to the same person to discover one another
• Browser API for Private Lift Measurement - Conceptual Overview ** Browser API for Private Lift Measurement - First Party ** Browser API for Private Lift Measurement - Third Party
• Real-Time Bidding Use Case
• Threat modeling for Cross-Browser Anonymous Conversion Reporting

We have also been gathering links to outside resources in issue 22

• Private fraud prevention
• Conversion measurement API
• Ad click attribution
• Trust token API
• Tracking prevention policy
• Privacy budget
• First party sets
• Privacy considerations
• Aggregate reporting API
• IP Blindness
• FLoC: Federated Learning of Cohorts
• PIGIN: Private Interest Groups, Including Noise