Asus issued a statement to answer the recent criticism that they did not comply with the GNU General Public License for the Asus Eee PC customized Linux OS.

Asus says that they have now published all source code to the best of their knowledge on this site. If something is still missing you can contact the Asus support.
Asus also announced the upcoming release of the Eee PC SDK. This will allow for development on the Eee PC by the OpenSource community making it easy to develop, easy to port, and easy to release software for the Eee PC platform.
More details on the Asus Eee PC site.

Asus Eee PC 4G and 4G Surf are currently selling in the United States. They are becoming hard to find. Currently NewEgg and Amazon are sold out.