I have attached a link below from Russian Television (RT) here in Moscow that describes the incident this morning. The video that is part of the local broadcast will give you an idea of how many people ride the metro each and every day. If you have challenges with this link...just go to www.rt.com ; it should be in English.
We are well and fine. We did not hear anything this morning when the blasts occurred. We are about a 20 minute walk from one of the sites which is close to the Kremlin. the blasts occurred deep underground.
http://rt.com/Top_News/2010-03-29/moscow-metro-blast-victims.html#