Via Harvard University's Extension School, one can obtain a Citation in Nano concentration upon completion of 4 courses within 3-years (to augment other credentials).
Offered thus far:
-Fundamentals of Microfabrication with Applications to MEMS
-Introduction to Nanoscale Science and Technology (offered in 2006-07)
-Introduction to Nanotechnology: Concepts and Applications
-Fundamentals of Microfluidics with Applications in Biological Analysis and Discovery
Distance Ed, Summer School, hybrid online/on-campus degrees, and online certifications available also in several nano-related disciplines.
GO FOR IT!