Seems to be interesting for those who are in nanotech.

http://www.physorg.com/news55.htm

"Yoshiaki Nakamura et al. ... grew Ge nanodots with a typical size of ~4 nm and ultrahigh density (>1012 cm–2) on ultrathin SixGe1–x oxide films made by oxidizing Ge wetting layers grown on Si (111)–(7×7) surfaces. ..."