Most remote desktops apps on Android can get pretty pricey. So, when a $2 RDP/VNC-compatible solution comes along, we take notice. Jump Desktop, a comparatively small player in this app category, has knocked 80% off the normal price of $10. Not bad! The service is pretty fully featured, including multi-touch support, the ability to connect via WiFi or 3G, and even SSH tunnel support!
The app works for both Windows and Mac systems.