Broadside Ballads from the Bodleian libraries hosts a great collection. I am especially impressed by the fantastic illustration archive, divided into neat and specific categories. Go look!
The University of California’s English Broadside Ballad Archive is also a fantastic project, with a dedicated team making previously hard to find (on microfiche or in archive) broadsides available to everyone, and transcribed to modern eyes and ears. Amazing. What we have online is amazing.
The exhibition is on in London til the end of November. Anyone fancy going?