I edited my previous post with some info regarding the efficeon. Ill try to find more, as I remember having seen an article that compared the efficeon with the Pentium-M, or something similar.
Found some nice articles and pictures. If you are interested in the notebook message forum member plswdth. He hasnt been on in like a month, but you could try sending him a PM and an email. He owns (owned?) the MM20 and it definetely seems like a nice PC. In fact, I have started thinking about getting one myself.
Another good article: