Comparison of netbook-oriented Linux distributions

Netbooks are small laptops, with screen sizes between approximately 7 and 12 inches and low power consumption. They use either an SSD (solid state disk) or a HDD (hard disk drive) for storage, have up to 2 gigabytes of RAM (but often less), lack an optical disk drive, and usually have USB, Ethernet, WiFi and often Bluetooth connectivity. The name emphasizes their use as portable Internet appliances.
Netbook distributions.
There are special Linux distributions, called netbook distributions, for these machines. All such distributions purport to be optimized for use with small, low-resolution displays. They tend to include a broad mix of VOIP and web-focused tools, including proprietary applications rarely seen installed by default by mainstream desktop distributions. For instance, Nokia Maemo and Asus' customized Xandros both ship with Skype and Adobe Flash installed, and Ubuntu's Netbook Edition offers the option to do the same for OEMs.
Comparison.
Google Trends.
While no public numbers measuring the install-base of these operating systems are available, Google Trends data on a handful of them indicate their relative popularity: