This netbook from South Korea uses a 4.8-inch screen, and the configuration is reasonable, taking the "small" realm to another level. It's probably the smallest laptop out there.
Settings:
CPU: Intel Atom at 1.1Ghz/1.33GH
Memory: 512MB/1GB
Screen: 4.8 "1,024 x 600 touch screen
Interface: WiBro, HSDPA, WiMAX, Wi-Fi, Bluetooth, DMB/DVB-T, miniUSB 2.0, microSD, USIM
Weight: 315 grams
Other: 1.3 megapixel camera, 8GB to 32GB SSD hard drive.