Few days ago NRL received a submission I liked a lot, but I rejected it finally. The manuscript itself is in fact decent but reports on the boundary of Nano and Micro, few hundreds of nanometers. The recommendation of both referees is a direct rejection due to the length scale.

Where should Micro researches be published these days?

Here one additional publishing option:

Nano-Micro Letters
ISSN: 2150-5551
http://www.nmletters.org/

This is a new open-access journal, not only free to readers as NRL but also free to authors (voluntary payment).

By the way, NRL is free to authors through the end of 2010.

Free is good :).