This $5 security app allows you to monitor multiple live video feeds, keeping a remote eye on pets, babies, nannies, offices, vacation property--and whatever else you need to keep tabs on. iCam operates via Wi-Fi, 3G, and Edge networks with most USB and FireWire webcams, and with cameras built into laptops and other devices. It works well with the 1st- and 2nd-gen iPads too.
So why is iCam included here? Because newer webcams like the Logitech HD Pro Webcam C920 deliver 1080p (1920-by-1080 pixel) resolution, making them a good match for the new iPad's 2048-by-1536 pixel display. (The iPad 2's screen is 1024-by-768 pixels.)