The Intel Atom processor refers to anything Silverthorne derived, that’s Silverthorne for ultra mobile devices and Diamondville for desktop and cheap notebooks (e.g. ASUS EeePC style laptops). Both of these processors are now called the Intel Atom.

Diamondville will launch in Q2 of this year as the Intel Atom 230, running at 1.6GHz with a 512KB L2 cache. The ultra mobile variants based on Silverthorne will also launch around the same time frame but at various clock frequencies of up to 1.8GHz with a 0.6W - 2.5W TDP.

http://www.anandtech.com/cpuchipsets...oc.aspx?i=3248