In Photoshop you can quickly access the Image size dialog box as well as the Canvas Size dialog box as both have their own shortcuts. For Image Size, use the shortcut Command + Option + I (PC: Control + Alt + I) and for Canvas Size use the shortcut Command + Option + C (PC: Control + Alt + C).
Most podcasts about the Creative Suite are about the tools in the apps. We put out a weekly podcast that mixes the tools with real-life techniques that help you learn to use the Creative Suite, creatively.