Jeffrey Friedl has a new Plugin (JPEG Export Quality Tester) that creates an export at Lightroom 13 available quality settings, along with a TIFF file, to judge the best compromise of Quality and Size.
Tim Armes has updated his Impact WSPP Gallery.
@Lightroom on Twitter linked to a Terry White video tutorial on going from Lightroom to HDR Pro in Photoshop.
George Jardine’s excellent videos about Lightroom’s Develop Module are now available as a DVD from Amazon. There’s a sample video at that link.