Podcasts on trade policy
Trade Talks by Chad P. Bown
Trade Splaining by Adrian Mollabeciri & Robert Skidmore
The Trade Guys by CSIS
Data on trade policy
Temporary Trade Barriers Database from the World Bank
Tariff Download Facility from the WTO
Data on trade policy changes by the Global Trade Alert
Global Preferential Trade Agreements Database from the World Bank
The Design of Trade Agreements (DESTA) database from the World Trade Institute
Regional Trade Agreements database by José de Sousa
WTO Disputes (chronologically)
Data on international trade
International trade flow data from UN Comtrade and CEPII
Exporter Dynamics Database from the World Bank
Trade in Value Added (TiVA) database from the OECD
World Input-Output Database (WIOD) by the University of Groningen
Data on US variables
US Input-Output Tables from the BEA
Data on lobbying and political contributions from LobbyView and OpenSecrets
US HS-level imports and exports by Peter K. Schott
Other useful datasets
EU variables from Eurostat
Correlates of War database
Useful links for gravity regressions
"The Log of Gravity" website
"The Gravity Cookbook" website