Rotate your screen with shortcuts or from the system tray, with iRotate

iRotate is a free (for personal use) and very small utility providing convenient access to the native rotation capabilities of modern display drivers, via a popup menu accessible from the system tray and optional system-wide hotkeys.

By leveraging the native rotation capabilities now provided by ATI, nVidia, Intel, Matrox, S3, XGI and other cards, iRotate offers  speed and efficiency, with minimal impact on system resources.

The iRotate package, including installation, documentation, and native language support in many European and Asian languages, weighs 125 kb.