Sales of downloadable Xbox Live Arcade games "almost tripled" in the week after the November 19th launch of the Xbox 360's new interface, Microsoft has announced.

In particular, Cabonated Games' UNO saw a 650% sales jump in just one day, a feat attributed to the fact that it was updated with support for the new customizable player avatars. NinjaBee's A Kingdom for Keflings, an avatar-utilizing game launched on November 19, "registered the second-best first week of performance ever."

In addition, Xbox Live members have added an average of 33% more friends since the New Xbox Experience hit, Xbox Live programming director Larry "Major Nelson" Hryb observed on his blog, though no explanation or hard numbers were given.

When the New Xbox Experience and its many new features hits Xbox 360s worldwide this Wednesday, November 19, the system will also receive its first downloadable game with support for the new Avatars: NinjaBee's city-builder A Kingdom for Keflings.

Priced at 800 Microsoft Points ($8), the latest Xbox Live Arcade title from the Band of Bugs and Cloning Clyde developer lets up to four online players run around, collecting resources and directing the diminutive keflings in their attempts to transform a village into a city while adapting with the constantly changing seasons.

In addition, several previously released Xbox Live Arcade games, including Bomberman Live and UNO, will be updated with support for Avatars come Wednesday.