I would like to use BigQuery to host datasets that others can query without incurring processing charges against my project. I understand that when I upload a dataset to a p
Absolutely! You can certainly make a dataset public to be queried from other projects, or even share your dataset only with a specific domain, group or user.
In this model, users would be charged for queries to their own Project IDs, while your project covers the storage costs of the datasets. Note that if the users running queries in a different project want to store their resulting tables from their query results, they would of course pay for this storage themselves.
BigQuery currently doesn't provide a mechanism for public dataset discovery. You would have to share the details of your project's public dataset(s) yourself. The GitHub Archive project has a good example of this.