We noticed that images linked into ticket notes (and ticket request detail) weren't scaling to fit automatically. Since some of the images we link are rather large (photos from mobile devices, scanned documents, etc.) they can quickly overwhelm the rest of the interface.
To solve this, I added
img{max-width:100%;height:auto;}to the beginning of the <InstallationDir>\bin\webapps\helpdesk\css\whdStyles.css file.